diff --git a/src-ui/app/_app_controllers/CornerRadiusController.jsx b/src-ui/app/_app_controllers/CornerRadiusController.jsx
index 1b84b9ad..b56d20c5 100644
--- a/src-ui/app/_app_controllers/CornerRadiusController.jsx
+++ b/src-ui/app/_app_controllers/CornerRadiusController.jsx
@@ -1,10 +1,12 @@
 import { useState, useEffect } from "react";
-import { getCurrentWindow } from "@tauri-apps/api/window";
+import { store } from "@store";
 
 export const CornerRadiusController = () => {
     const [is_win11, setIsWin11] = useState(false);
     const [is_maximized, setIsMaximized] = useState(false);
 
+    const appWindow = store.appWindow;
+
     // OS 判定（Win11 なら platformVersion の major ≥13）
     useEffect(() => {
         if (navigator.userAgentData?.getHighEntropyValues) {
@@ -27,12 +29,11 @@ export const CornerRadiusController = () => {
     useEffect(() => {
         let unlisten;
         const setup = async () => {
-            const window = await getCurrentWindow();
             // 初期状態取得
-            setIsMaximized(await window.isMaximized());
+            setIsMaximized(await appWindow.isMaximized());
             // リサイズ時にも再取得
-            const updateMax = () => window.isMaximized().then(setIsMaximized);
-            unlisten = await window.listen("tauri://resize", updateMax);
+            const updateMax = () => appWindow.isMaximized().then(setIsMaximized);
+            unlisten = await appWindow.listen("tauri://resize", updateMax);
         }
         setup();
 
diff --git a/src-ui/app/error_boundary/AppErrorBoundary.jsx b/src-ui/app/error_boundary/AppErrorBoundary.jsx
index 0cc5dfb2..4aeb34a2 100644
--- a/src-ui/app/error_boundary/AppErrorBoundary.jsx
+++ b/src-ui/app/error_boundary/AppErrorBoundary.jsx
@@ -1,5 +1,4 @@
 import { useState } from "react";
-import { getCurrentWindow } from "@tauri-apps/api/window";
 import { ErrorBoundary } from "react-error-boundary";
 import XMarkSvg from "@images/cancel.svg?react";
 import CopySvg from "@images/copy.svg?react";
@@ -7,6 +6,8 @@ import CheckMarkSvg from "@images/check_mark.svg?react";
 
 import { ContactsContainer } from "./contacts_container/ContactsContainer";
 
+import { useWindow } from "@logics_common";
+
 import styles from "./AppErrorBoundary.module.scss";
 
 export const AppErrorBoundary = ({children}) => {
@@ -65,14 +66,9 @@ const ErrorContainer = ({error}) => {
 };
 
 const CloseButtonContainer = () => {
-
-    const asyncClose = async () => {
-        const appWindow = await getCurrentWindow();
-        appWindow.close();
-    };
-
+    const { asyncCloseApp } = useWindow();
     return (
-        <button className={styles.close_button_wrapper} onClick={asyncClose}>
+        <button className={styles.close_button_wrapper} onClick={asyncCloseApp}>
             <div className={styles.close_button}>
                 <XMarkSvg className={styles.x_mark_svg}/>
             </div>
diff --git a/src-ui/app/index.jsx b/src-ui/app/index.jsx
index 03c4e13a..debb0978 100644
--- a/src-ui/app/index.jsx
+++ b/src-ui/app/index.jsx
@@ -2,6 +2,10 @@ import React from "react";
 import ReactDOM from "react-dom/client";
 import "@root/locales/config.js";
 import "./_index_css/root.css";
+import { getCurrentWindow } from "@tauri-apps/api/window";
+
+import { store } from "@store";
+store.appWindow = await getCurrentWindow();
 
 import { App } from "./App";
 
diff --git a/src-ui/app/main_page/main_section/message_container/message_input_box/MessageInputBox.jsx b/src-ui/app/main_page/main_section/message_container/message_input_box/MessageInputBox.jsx
index 2e0f4683..765ea9e1 100644
--- a/src-ui/app/main_page/main_section/message_container/message_input_box/MessageInputBox.jsx
+++ b/src-ui/app/main_page/main_section/message_container/message_input_box/MessageInputBox.jsx
@@ -5,7 +5,6 @@ import { useMessage } from "@logics_common";
 import { useSendMessageButtonType, useEnableAutoClearMessageInputBox } from "@logics_configs";
 import { useMessageLogScroll } from "@logics_main";
 import { store } from "@store";
-import { getCurrentWindow } from "@tauri-apps/api/window";
 
 export const MessageInputBox = () => {
     const [message_history, setMessageHistory] = useState([]);
@@ -41,8 +40,6 @@ export const MessageInputBox = () => {
 
     const onSubmitFunction = (e) => {
         e.preventDefault();
-        // const appWindow = getCurrentWindow();
-        // appWindow.minimize();
 
         if (!currentMessageInputValue.data.trim()) return updateMessageInputValue("");
 
diff --git a/src-ui/app/splash_component/SplashComponent.jsx b/src-ui/app/splash_component/SplashComponent.jsx
index 02cab1ac..2943bad0 100644
--- a/src-ui/app/splash_component/SplashComponent.jsx
+++ b/src-ui/app/splash_component/SplashComponent.jsx
@@ -4,7 +4,7 @@ import { StartUpProgressContainer } from "./start_up_progress_container/StartUpP
 import { DownloadModelsContainer } from "./download_models_container/DownloadModelsContainer/";
 import MegaphoneSvg from "@images/megaphone.svg?react";
 import XMarkSvg from "@images/cancel.svg?react";
-import { getCurrentWindow } from "@tauri-apps/api/window";
+import { useWindow } from "@logics_common";
 import clsx from "clsx";
 
 export const SplashComponent = () => {
@@ -73,13 +73,10 @@ const AnnouncementsContainer = () => {
 
 
 const CloseButtonContainer = () => {
-    const asyncClose = async () => {
-        const appWindow = await getCurrentWindow();
-        appWindow.close();
-    };
+    const { asyncCloseApp } = useWindow();
 
     return (
-        <button className={styles.close_button_wrapper} onClick={asyncClose}>
+        <button className={styles.close_button_wrapper} onClick={asyncCloseApp}>
             <div className={styles.close_button}>
                 <XMarkSvg className={styles.x_mark_svg}/>
             </div>
diff --git a/src-ui/app/window_title_bar/WindowTitleBar.jsx b/src-ui/app/window_title_bar/WindowTitleBar.jsx
index 16be380c..a8848b3e 100644
--- a/src-ui/app/window_title_bar/WindowTitleBar.jsx
+++ b/src-ui/app/window_title_bar/WindowTitleBar.jsx
@@ -1,3 +1,4 @@
+import { useWindow } from "@logics_common";
 // import clsx from "clsx";
 import styles from "./WindowTitleBar.module.scss";
 import XMarkSvg from "@images/cancel.svg?react";
@@ -5,29 +6,8 @@ import SquareSvg from "@images/square.svg?react";
 import LineSvg from "@images/line.svg?react";
 import VrctSvg from "@images/vrct.svg?react";
 
-import { getCurrentWindow } from "@tauri-apps/api/window";
-
 export const WindowTitleBar = () => {
-
-    const asyncMinimize = async () => {
-        const appWindow = await getCurrentWindow();
-        appWindow.minimize();
-    };
-
-    const asyncMaximize = async () => {
-        const appWindow = await getCurrentWindow();
-        const maximizeState = await appWindow.isMaximized();
-        if (!maximizeState) {
-            appWindow.maximize();
-        } else {
-            appWindow.unmaximize();
-        }
-    };
-
-    const asyncClose = async () => {
-        const appWindow = await getCurrentWindow();
-        appWindow.close();
-    };
+    const { asyncCloseApp, asyncToggleMaximizeApp, asyncMinimizeApp} = useWindow();
 
     return (
         <div className={styles.container}>
@@ -37,13 +17,13 @@ export const WindowTitleBar = () => {
                 </div>
 
                 <div className={styles.window_control_wrapper}>
-                    <div className={styles.minimize_button} onClick={asyncMinimize}>
+                    <div className={styles.minimize_button} onClick={asyncMinimizeApp}>
                         <LineSvg className={styles.line_svg}/>
                     </div>
-                    <div className={styles.maximize_button} onClick={asyncMaximize}>
+                    <div className={styles.maximize_button} onClick={asyncToggleMaximizeApp}>
                         <SquareSvg className={styles.square_svg}/>
                     </div>
-                    <div className={styles.close_button} onClick={asyncClose}>
+                    <div className={styles.close_button} onClick={asyncCloseApp}>
                         <XMarkSvg className={styles.x_mark_svg}/>
                     </div>
                 </div>
diff --git a/src-ui/logics/common/useWindow.js b/src-ui/logics/common/useWindow.js
index 01e3618d..88182dd6 100644
--- a/src-ui/logics/common/useWindow.js
+++ b/src-ui/logics/common/useWindow.js
@@ -1,5 +1,5 @@
 import { useEffect, useRef } from "react";
-import { getCurrentWindow, currentMonitor, availableMonitors, PhysicalPosition, PhysicalSize } from "@tauri-apps/api/window";
+import { currentMonitor, availableMonitors, PhysicalPosition, PhysicalSize } from "@tauri-apps/api/window";
 import { useStdoutToPython } from "@logics/useStdoutToPython";
 import { useStore_IsBreakPoint } from "@store";
 import { useUiScaling } from "@logics_configs";
@@ -10,9 +10,9 @@ export const useWindow = () => {
     const { currentUiScaling } = useUiScaling();
     const { updateIsBreakPoint } = useStore_IsBreakPoint();
 
+    const appWindow = store.appWindow;
 
     const asyncGetWindowGeometry = async () => {
-        const appWindow = await getCurrentWindow();
         try {
             const position = await appWindow.outerPosition();
             const { x: x_pos, y: y_pos } = position;
@@ -32,7 +32,6 @@ export const useWindow = () => {
     };
 
     const asyncSaveWindowGeometry = async () => {
-        const appWindow = await getCurrentWindow();
         const minimized = await appWindow.isMinimized();
         if (minimized === true) return; // don't save while the window is minimized.
         const data = await asyncGetWindowGeometry();
@@ -40,8 +39,6 @@ export const useWindow = () => {
     };
 
     const restoreWindowGeometry = async (data) => {
-        const appWindow = await getCurrentWindow();
-
         try {
             const monitors = await availableMonitors();
             const { x_pos, y_pos, width, height } = data;
@@ -95,7 +92,6 @@ export const useWindow = () => {
     };
 
     const asyncUpdateBreakPoint = async () => {
-        const appWindow = await getCurrentWindow();
         const size = await appWindow.innerSize();
         const dynamicBreakPoint = 800 * (currentUiScaling.data / 100);
         updateIsBreakPoint(size.width <= dynamicBreakPoint);
@@ -109,10 +105,7 @@ export const useWindow = () => {
         const unlistenMove   = useRef(null);
 
         useEffect(() => {
-            const setup = async () => {
-                if (store.is_register_window_geometry_controller) return;
-                const appWindow = await getCurrentWindow();
-
+            const setup = () => {
                 unlistenResize.current = appWindow.onResized(() => {
                     clearTimeout(resizeTimeout.current);
                     resizeTimeout.current = setTimeout(() => {
@@ -127,7 +120,6 @@ export const useWindow = () => {
                         asyncSaveWindowGeometry();
                     }, 200);
                 });
-                store.is_register_window_geometry_controller = true;
             };
 
             setup();
@@ -148,10 +140,30 @@ export const useWindow = () => {
         return null;
     };
 
+    const asyncToggleMaximizeApp = async () => {
+        const maximizeState = await appWindow.isMaximized();
+        if (!maximizeState) {
+            await appWindow.maximize();
+        } else {
+            await appWindow.unmaximize();
+        }
+    };
+
+    const asyncMinimizeApp = async () => {
+        await appWindow.minimize();
+    };
+    const asyncCloseApp = async () => {
+        await appWindow.close();
+    };
+
     return {
         WindowGeometryController,
         asyncSaveWindowGeometry,
         restoreWindowGeometry,
         asyncUpdateBreakPoint,
+
+        asyncCloseApp,
+        asyncToggleMaximizeApp,
+        asyncMinimizeApp,
     };
 };
diff --git a/src-ui/logics/configs/hotkeys/useHotkeys.js b/src-ui/logics/configs/hotkeys/useHotkeys.js
index 6991d0f6..a2bbe35d 100644
--- a/src-ui/logics/configs/hotkeys/useHotkeys.js
+++ b/src-ui/logics/configs/hotkeys/useHotkeys.js
@@ -1,5 +1,3 @@
-import { getCurrentWindow } from "@tauri-apps/api/window";
-
 import { store, useStore_Hotkeys } from "@store";
 import { useStdoutToPython } from "@logics/useStdoutToPython";
 import { useNotificationStatus } from "@logics_common";
@@ -7,6 +5,8 @@ import { useMainFunction } from "@logics_main";
 import { register, unregisterAll, isRegistered } from "@tauri-apps/plugin-global-shortcut";
 
 export const useHotkeys = () => {
+    const appWindow = store.appWindow;
+
     const { asyncStdoutToPython } = useStdoutToPython();
     const { currentHotkeys, updateHotkeys, pendingHotkeys } = useStore_Hotkeys();
     const {
@@ -68,8 +68,6 @@ export const useHotkeys = () => {
                 if (!isAlreadyRegistered) {
                     await register(shortcut, async (event) => {
                         if (event.state !== "Pressed") return;
-                        const appWindow = await getCurrentWindow();
-
                         switch (actionKey) {
                             case "toggle_vrct_visibility": {
                                 const minimized = await appWindow.isMinimized();
diff --git a/src-ui/logics/main/useMainFunction.js b/src-ui/logics/main/useMainFunction.js
index 714ea2af..05be0662 100644
--- a/src-ui/logics/main/useMainFunction.js
+++ b/src-ui/logics/main/useMainFunction.js
@@ -1,4 +1,4 @@
-import { getCurrentWindow } from "@tauri-apps/api/window";
+import { store } from "@store";
 
 import {
     useStore_TranslationStatus,
@@ -6,10 +6,11 @@ import {
     useStore_TranscriptionReceiveStatus,
     useStore_ForegroundStatus,
 } from "@store";
-import { useCallback } from "react";
 import { useStdoutToPython } from "@logics/useStdoutToPython";
 
 export const useMainFunction = () => {
+    const appWindow = store.appWindow;
+
     const {
         currentTranslationStatus,
         updateTranslationStatus,
@@ -76,9 +77,8 @@ export const useMainFunction = () => {
 
 
     const toggleForeground = async () => {
-        const main_page = await getCurrentWindow();
         const is_foreground_enabled = !currentForegroundStatus.data;
-        main_page.setAlwaysOnTop(is_foreground_enabled);
+        await appWindow.setAlwaysOnTop(is_foreground_enabled);
         updateForegroundStatus(is_foreground_enabled);
     };
 
diff --git a/src-ui/logics/main/useMessageInputBoxRatio.js b/src-ui/logics/main/useMessageInputBoxRatio.js
index 328a97e0..b8f8430c 100644
--- a/src-ui/logics/main/useMessageInputBoxRatio.js
+++ b/src-ui/logics/main/useMessageInputBoxRatio.js
@@ -1,8 +1,9 @@
-import { getCurrentWindow } from "@tauri-apps/api/window";
+import { store } from "@store";
 import { useStore_MessageInputBoxRatio } from "@store";
 import { useStdoutToPython } from "@logics/useStdoutToPython";
 import { clampMinMax } from "@utils";
 export const useMessageInputBoxRatio = () => {
+    const appWindow = store.appWindow;
 
     const { asyncStdoutToPython } = useStdoutToPython();
     const { currentMessageInputBoxRatio, updateMessageInputBoxRatio } = useStore_MessageInputBoxRatio();
@@ -12,7 +13,6 @@ export const useMessageInputBoxRatio = () => {
     };
 
     const asyncSetMessageInputBoxRatio = async (ratio) => {
-        const appWindow = getCurrentWindow();
         const minimized = await appWindow.isMinimized();
         if (minimized === true) return; // don't save while the window is minimized.
         const parsed = parseFloat(ratio.toFixed(2));