diff --git a/shimatta_kenkyusho/shimatta_kenkyusho/settings.py b/shimatta_kenkyusho/shimatta_kenkyusho/settings.py
index 8966031..9905e0e 100644
--- a/shimatta_kenkyusho/shimatta_kenkyusho/settings.py
+++ b/shimatta_kenkyusho/shimatta_kenkyusho/settings.py
@@ -95,23 +95,11 @@ WSGI_APPLICATION = 'shimatta_kenkyusho.wsgi.application'
 
 # Database
 # https://docs.djangoproject.com/en/3.2/ref/settings/#databases
-def get_env_value(env_variable, default=None):
-    try:
-        return os.environ[env_variable]
-    except KeyError:
-        if default is not None:
-            return default
-        error_msg = 'Set the {} environment variable'.format(env_variable)
-        raise Exception(error_msg)
-
 
 DATABASES = {
     'default': {
-        'ENGINE': 'django.db.backends.postgresql',
-        'NAME': 'shimatta_kenkyusho',
-        'USER': get_env_value('DJANGO_POSTGRESQL_USER'),
-        'PASSWORD': '',
-        'HOST': get_env_value('DJANGO_POSTGRESQL_SOCKET'),
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
     }
 }
 
diff --git a/shimatta_kenkyusho/shimatta_kenkyusho/settings_sqlite.py b/shimatta_kenkyusho/shimatta_kenkyusho/settings_sqlite.py
deleted file mode 100644
index 9905e0e..0000000
--- a/shimatta_kenkyusho/shimatta_kenkyusho/settings_sqlite.py
+++ /dev/null
@@ -1,185 +0,0 @@
-"""
-Django settings for shimatta_kenkyusho project.
-
-Generated by 'django-admin startproject' using Django 3.2.5.
-
-For more information on this file, see
-https://docs.djangoproject.com/en/3.2/topics/settings/
-
-For the full list of settings and their values, see
-https://docs.djangoproject.com/en/3.2/ref/settings/
-"""
-
-from pathlib import Path
-import os
-
-# Build paths inside the project like this: BASE_DIR / 'subdir'.
-BASE_DIR = Path(__file__).resolve().parent.parent
-
-
-# Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
-
-# SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = 'django-insecure-vq_@ue3ul@&4bz7wkcpf3pjrwf8o$7g!z-rw$ftr-$)7l3*m=^'
-
-# SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = True
-
-ALLOWED_HOSTS = ['localhost']
-
-
-# Application definition
-
-INSTALLED_APPS = [
-    'django.contrib.admin',
-    'django.contrib.auth',
-    'django.contrib.contenttypes',
-    'django.contrib.sessions',
-    'django.contrib.messages',
-    'django.contrib.staticfiles',
-    'parts.apps.PartsConfig',
-    'api.apps.ApiConfig',
-    'rest_framework.authtoken',
-    'django_filters',
-    'qr_code',
-    'rest_framework',
-    'crispy_forms',
-    'crispy_bootstrap5',
-    'django.forms',
-]
-
-FORM_RENDERER = 'django.forms.renderers.TemplatesSetting'
-
-MIDDLEWARE = [
-    'django.middleware.security.SecurityMiddleware',
-    'django.contrib.sessions.middleware.SessionMiddleware',
-    'django.middleware.common.CommonMiddleware',
-    'django.middleware.csrf.CsrfViewMiddleware',
-    'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.messages.middleware.MessageMiddleware',
-    'django.middleware.clickjacking.XFrameOptionsMiddleware',
-]
-
-ROOT_URLCONF = 'shimatta_kenkyusho.urls'
-
-CACHES = {
-	'default': {
-		'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-	},
-	'qr-code': {
-		'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-		'LOCATION': 'qr-code-cache',
-		'TIMEOUT': 3600
-	}
-}
-
-TEMPLATES = [
-    {
-        'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [os.path.join(BASE_DIR, 'templates'),],
-        'APP_DIRS': True,
-        'OPTIONS': {
-            'context_processors': [
-                'django.template.context_processors.debug',
-                'django.template.context_processors.request',
-                'django.contrib.auth.context_processors.auth',
-                'django.contrib.messages.context_processors.messages',
-            ],
-        },
-    },
-]
-
-WSGI_APPLICATION = 'shimatta_kenkyusho.wsgi.application'
-
-
-# Database
-# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
-
-DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': BASE_DIR / 'db.sqlite3',
-    }
-}
-
-
-# Password validation
-# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators
-
-AUTH_PASSWORD_VALIDATORS = [
-    {
-        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
-    },
-    {
-        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
-    },
-    {
-        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
-    },
-    {
-        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
-    },
-]
-
-REST_FRAMEWORK = {
-	'DEFAULT_AUTHENTICATION_CLASSES': [
-		'rest_framework.authentication.BasicAuthentication',
-		'rest_framework.authentication.SessionAuthentication',
-		'api.ExpiringAuthToken.ExpiringTokenAuthentication',
-	],
-	'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
-	'PAGE_SIZE': 10,
-	'DEFAULT_THROTTLE_CLASSES': [
-		'rest_framework.throttling.AnonRateThrottle',
-		'rest_framework.throttling.UserRateThrottle'
-	],
-	'DEFAULT_THROTTLE_RATES': {
-		'anon': '100/hour',
-		'user': '2000/hour'
-	}
-
-}
-
-REST_FRAMEWORK_TOKEN_EXPIRE_HOURS = 4
-
-
-# Internationalization
-# https://docs.djangoproject.com/en/3.2/topics/i18n/
-
-LANGUAGE_CODE = 'en-us'
-
-TIME_ZONE = 'UTC'
-
-USE_I18N = True
-
-USE_L10N = True
-
-USE_TZ = True
-
-
-# Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/3.2/howto/static-files/
-
-STATIC_URL = '/static/'
-
-STATICFILES_DIRS = [
-    os.path.join(BASE_DIR, "static"),
-]
-
-# Default primary key field type
-# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
-
-DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
-MEDIA_URL = '/media/'
-MEDIA_ROOT = os.path.join(BASE_DIR, "media")
-
-LOGIN_URL = '/login'
-LOGIN_REDIRECT_URL = '/'
-
-
-SHIMATTA_KENKYUSHO_TITLE = 'しまった・研究所'
-
-CRISPY_ALLOWED_TEMPLATE_PACKS = "bootstrap5"
-
-CRISPY_TEMPLATE_PACK = "bootstrap5"
\ No newline at end of file