diff --git a/utils.py b/utils.py
index 3033cb13..a68474fb 100644
--- a/utils.py
+++ b/utils.py
@@ -3,4 +3,10 @@ from PIL.Image import open as Image_open
 
 def getImageFile(file_name):
     img = Image_open(os_path.join(os_path.dirname(__file__), "img", file_name))
-    return img
\ No newline at end of file
+    return img
+
+def get_key_by_value(dictionary, value):
+    for key, val in dictionary.items():
+        if val == value:
+            return key
+    return None
\ No newline at end of file
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/createSideMenuAndSettingsBoxContainers.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/createSideMenuAndSettingsBoxContainers.py
index 161d5e96..3a28865b 100644
--- a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/createSideMenuAndSettingsBoxContainers.py
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/createSideMenuAndSettingsBoxContainers.py
@@ -6,7 +6,7 @@ from .addConfigSideMenuItem import addConfigSideMenuItem
 from .createSettingBoxContainer import createSettingBoxContainer
 
 
-from .setting_box_containers import createSettingBox_General
+from .setting_box_containers import createSettingBox_Appearance
 
 
 def createSideMenuAndSettingsBoxContainers(config_window, settings):
@@ -45,16 +45,14 @@ def createSideMenuAndSettingsBoxContainers(config_window, settings):
 
     side_menu_and_setting_box_containers_settings = [
         {
-            "side_menu_tab_attr_name": "side_menu_tab_general",
-            "label_attr_name": "label_general",
-            "selected_mark_attr_name": "translation_selected_mark",
-            "text": "General",
+            "side_menu_tab_attr_name": "side_menu_tab_appearance",
+            "label_attr_name": "label_appearance",
+            "selected_mark_attr_name": "selected_mark_appearance",
+            "text": "Appearance",
             "setting_box_container_settings": {
-                "setting_box_container_attr_name": "setting_box_container_general",
+                "setting_box_container_attr_name": "setting_box_container_appearance",
                 "setting_boxes": [
-                    { "section_title": None, "setting_box": createSettingBox_General },
-                    # { "section_title": "General Section Title", "setting_box": createSettingBox_General },
-                    # { "section_title": None, "setting_box": createSettingBox_General },
+                    { "section_title": None, "setting_box": createSettingBox_Appearance },
                 ]
             },
             "activate_by_default": True,
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/SettingBoxGenerator.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/SettingBoxGenerator.py
index 5e0a530d..c304fbc0 100644
--- a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/SettingBoxGenerator.py
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/SettingBoxGenerator.py
@@ -3,6 +3,7 @@ from ctk_scrollable_dropdown import CTkScrollableDropdown
 
 from vrct_gui.ui_utils import createButtonWithImage
 
+from typing import Union
 
 
 class SettingBoxGenerator():
@@ -154,7 +155,7 @@ class SettingBoxGenerator():
 
 
 
-    def createSettingBoxSlider(self, parent_widget, label_text, desc_text, slider_attr_name, slider_range, slider_number_of_steps, command, variable):
+    def createSettingBoxSlider(self, parent_widget, label_text, desc_text, slider_attr_name, slider_range, command, variable, slider_number_of_steps: Union[int, None] = None):
         (setting_box_frame, setting_box_frame_wrapper) = self._createSettingBoxFrame(parent_widget, label_text, desc_text)
 
         setting_box_slider_frame = CTkFrame(setting_box_frame_wrapper, corner_radius=0, width=0, height=0, fg_color=self.ctm.SB__BG_COLOR)
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/__init__.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/__init__.py
index f992f8c0..d0733fd4 100644
--- a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/__init__.py
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/__init__.py
@@ -1 +1 @@
-from .setting_box_general import createSettingBox_General
\ No newline at end of file
+from .setting_box_appearance import createSettingBox_Appearance
\ No newline at end of file
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__init__.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__init__.py
new file mode 100644
index 00000000..7dd435d8
--- /dev/null
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__init__.py
@@ -0,0 +1 @@
+from .createSettingBox_Appearance import createSettingBox_Appearance
\ No newline at end of file
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/createSettingBox_General.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__tmp.py
similarity index 99%
rename from vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/createSettingBox_General.py
rename to vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__tmp.py
index 70fd7bd3..51b4c0e6 100644
--- a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/createSettingBox_General.py
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/__tmp.py
@@ -7,7 +7,7 @@ from ..SettingBoxGenerator import SettingBoxGenerator
 
 from config import config
 
-def createSettingBox_General(setting_box_wrapper, config_window, settings):
+def __tmp(setting_box_wrapper, config_window, settings):
 
 
     sbg = SettingBoxGenerator(config_window, settings)
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/createSettingBox_Appearance.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/createSettingBox_Appearance.py
new file mode 100644
index 00000000..e209e8af
--- /dev/null
+++ b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_appearance/createSettingBox_Appearance.py
@@ -0,0 +1,114 @@
+from time import sleep
+
+from customtkinter import StringVar, IntVar
+from tkinter import font as tk_font
+from languages import selectable_languages
+from utils import get_key_by_value
+
+
+from ..SettingBoxGenerator import SettingBoxGenerator
+
+from config import config
+
+def createSettingBox_Appearance(setting_box_wrapper, config_window, settings):
+
+
+    sbg = SettingBoxGenerator(config_window, settings)
+
+    createSettingBoxDropdownMenu = sbg.createSettingBoxDropdownMenu
+    createSettingBoxSlider = sbg.createSettingBoxSlider
+
+
+    # 関数名は変えるかもしれない。
+    # テーマ変更、フォント変更時、 Widget再生成か再起動かは検討中
+
+
+    def slider_transparency_callback(value):
+        # self.parent.wm_attributes("-alpha", int(value/100))
+        config.TRANSPARENCY = int(value)
+
+    def optionmenu_appearance_theme_callback(value):
+        config.APPEARANCE_THEME = value
+
+    def optionmenu_ui_scaling_callback(value):
+        # self.optionmenu_ui_scaling.set(choice)
+        # new_scaling_float = int(choice.replace("%", "")) / 100
+        config.UI_SCALING = value
+
+    def optionmenu_font_family_callback(value):
+        config.FONT_FAMILY = value
+
+    def optionmenu_ui_language_callback(value):
+        config.UI_LANGUAGE = get_key_by_value(selectable_languages, value)
+
+    row=0
+    config_window.sb__transparency = createSettingBoxSlider(
+        parent_widget=setting_box_wrapper,
+        label_text="Transparency",
+        desc_text="Change the window's transparency. 50% to 100%. (Default: 100%)",
+        slider_attr_name="sb__transparency_slider",
+        slider_range=(50, 100),
+        command=lambda value: slider_transparency_callback(value),
+        variable=IntVar(value=config.TRANSPARENCY),
+    )
+    config_window.sb__transparency.grid(row=row)
+    row+=1
+
+
+    config_window.sb__appearance_theme = createSettingBoxDropdownMenu(
+        parent_widget=setting_box_wrapper,
+        label_text="Theme",
+        desc_text="Change the color theme from \"Light\" and \"Dark\". If you select \"System\", It will adjust based on your Windows theme. (Default: System)",
+        optionmenu_attr_name="sb__appearance_theme_optionmenu",
+        dropdown_menu_attr_name="sb__appearance_theme_dropdown",
+        dropdown_menu_values=["Light", "Dark", "System"],
+        command=lambda value: optionmenu_appearance_theme_callback(value),
+        variable=StringVar(value=config.APPEARANCE_THEME)
+    )
+    config_window.sb__appearance_theme.grid(row=row)
+    row+=1
+
+
+    config_window.sb__ui_scaling = createSettingBoxDropdownMenu(
+        parent_widget=setting_box_wrapper,
+        label_text="UI Size",
+        desc_text="(Default: 100%)",
+        optionmenu_attr_name="sb__ui_scaling_optionmenu",
+        dropdown_menu_attr_name="sb__ui_scaling_dropdown",
+        dropdown_menu_values=["80%", "90%", "100%", "110%", "120%"],
+        command=lambda value: optionmenu_ui_scaling_callback(value),
+        variable=StringVar(value=config.UI_SCALING)
+    )
+    config_window.sb__ui_scaling.grid(row=row)
+    row+=1
+
+
+    # font_families = list(tk_font.families())
+    config_window.sb__font_family = createSettingBoxDropdownMenu(
+        parent_widget=setting_box_wrapper,
+        label_text="Font Family",
+        desc_text="(Default: Yu Gothic UI)",
+        optionmenu_attr_name="sb__font_family_optionmenu",
+        dropdown_menu_attr_name="sb__font_family_dropdown",
+        dropdown_menu_values=["Font A", "Font B"],
+        # dropdown_menu_values=font_families,
+        command=lambda value: optionmenu_font_family_callback(value),
+        variable=StringVar(value=config.FONT_FAMILY)
+    )
+    config_window.sb__font_family.grid(row=row)
+    row+=1
+
+
+    selectable_languages_values = list(selectable_languages.values())
+    config_window.sb__ui_language = createSettingBoxDropdownMenu(
+        parent_widget=setting_box_wrapper,
+        label_text="UI Language",
+        desc_text="(Default: English)",
+        optionmenu_attr_name="sb__ui_language_optionmenu",
+        dropdown_menu_attr_name="sb__ui_language_dropdown",
+        dropdown_menu_values=selectable_languages_values,
+        command=lambda value: optionmenu_ui_language_callback(value),
+        variable=StringVar(value=selectable_languages[config.UI_LANGUAGE]),
+    )
+    config_window.sb__ui_language.grid(row=row)
+    row+=1
\ No newline at end of file
diff --git a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/__init__.py b/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/__init__.py
deleted file mode 100644
index c0c243b9..00000000
--- a/vrct_gui/config_window/widgets/createSideMenuAndSettingsBoxContainers/setting_box_containers/setting_box_general/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-from .createSettingBox_General import createSettingBox_General
\ No newline at end of file