diff --git a/.github/workflows/e2e-dashboard-tests.yml b/.github/workflows/e2e-dashboard-tests.yml
index 929680a1..45258fb0 100644
--- a/.github/workflows/e2e-dashboard-tests.yml
+++ b/.github/workflows/e2e-dashboard-tests.yml
@@ -8,9 +8,9 @@ on:
       - '**.py'
       - '**.ts'
       - '**.tsx'
-      - 'package.json'
-      - 'package-lock.json'
-      - 'tsconfig.json'
+      - 'optuna_dashboard/package.json'
+      - 'optuna_dashboard/package-lock.json'
+      - 'optuna_dashboard/tsconfig.json'
 jobs:
   test:
     runs-on: ubuntu-20.04
@@ -24,8 +24,12 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '16'
-      - run: npm install
-      - run: npm run build:dev
+
+      - name: Build bundle.js
+        working-directory: optuna_dashboard
+        run: |
+          npm install
+          npm run build:dev
 
       - name: Set up Python
         uses: actions/setup-python@v2
diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index 2e1bdb41..d2ddf54d 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -18,8 +18,12 @@ jobs:
       uses: actions/setup-node@v2
       with:
         node-version: '16'
-    - run: npm install
-    - run: npm run build:prd
+    
+    - name: Build bundle.js
+      working-directory: optuna_dashboard
+      run: |
+        npm install
+        npm run build:prd
 
     - name: Set up Python
       uses: actions/setup-python@v4
diff --git a/.github/workflows/typescript-tests.yml b/.github/workflows/typescript-tests.yml
index 5873f024..b536105a 100644
--- a/.github/workflows/typescript-tests.yml
+++ b/.github/workflows/typescript-tests.yml
@@ -6,9 +6,10 @@ on:
       - '.eslintrc.js'
       - '**.ts'
       - '**.tsx'
-      - 'package.json'
-      - 'package-lock.json'
-      - 'tsconfig.json'
+      - 'optuna_dashboard/package.json'
+      - 'optuna_dashboard/package-lock.json'
+      - 'optuna_dashboard/tsconfig.json'
+      - 'optuna_dashboard/webpack.config.js'
 jobs:
   lint:
     name: Lint checking on Ubuntu
@@ -37,7 +38,9 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '16'
-      - run: |
+      - name: Build bundle.js
+        working-directory: optuna_dashboard
+        run: |
           npm install
           npm run build:dev
           npm run build:prd
@@ -54,6 +57,8 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '16'
-      - run: |
+      - name: Run jest
+        working-directory: optuna_dashboard
+        run: |
           npm install
           npm run test
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index df519b53..53e5059a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,6 +26,7 @@ The repository is organized as follows:
 Node.js v16 is required to compile TypeScript files.
 
 ```
+$ cd optuna_dashboard/
 $ npm install
 $ npm run build:dev
 ```
@@ -34,6 +35,7 @@ $ npm run build:dev
 <summary>Watch for files changes</summary>
 
 ```
+$ cd optuna_dashboard/
 $ npm run watch
 ```
 
@@ -43,6 +45,7 @@ $ npm run watch
 <summary>Production builds</summary>
 
 ```
+$ cd optuna_dashboard/
 $ npm run build:prd
 ```
 
diff --git a/Dockerfile b/Dockerfile
index 2f54020f..035eb835 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
 FROM node:20 AS front-builder
-WORKDIR /usr/src
+WORKDIR /usr/src/optuna_dashboard
 
-ADD ./package.json /usr/src/package.json
-ADD ./package-lock.json /usr/src/package-lock.json
+ADD ./optuna_dashboard/package.json /usr/src/optuna_dashboard/package.json
+ADD ./optuna_dashboard/package-lock.json /usr/src/optuna_dashboard/package-lock.json
 RUN npm install
 
-ADD ./tsconfig.json /usr/src/tsconfig.json
-ADD ./webpack.config.js /usr/src/webpack.config.js
+ADD ./optuna_dashboard/tsconfig.json /usr/src/optuna_dashboard/tsconfig.json
+ADD ./optuna_dashboard/webpack.config.js /usr/src/optuna_dashboard/webpack.config.js
 ADD ./optuna_dashboard/ts/ /usr/src/optuna_dashboard/ts
 RUN mkdir -p /usr/src/optuna_dashboard/public
 RUN npm run build:prd
diff --git a/Makefile b/Makefile
index 55e8e69d..ab0a5778 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ vscode/assets/bundle.js: $(RUSTLIB_OUT) $(STANDALONE_SRC)
 	cd standalone_app && npm install && npm run build:vscode
 
 $(DASHBOARD_TS_OUT): $(DASHBOARD_TS_SRC)
-	npm install && npm run build:$(MODE)
+	cd optuna_dashboard && npm install && npm run build:$(MODE)
 
 .PHONY: serve-browser-app
 serve-browser-app: $(RUSTLIB_OUT)
diff --git a/optuna_dashboard/package.json b/optuna_dashboard/package.json
index 5e0ee00a..e9afdac9 100644
--- a/optuna_dashboard/package.json
+++ b/optuna_dashboard/package.json
@@ -9,7 +9,7 @@
     "build": "webpack",
     "build:dev": "NODE_ENV=development TYPESCRIPT_LOADER=esbuild-loader webpack",
     "build:prd": "NODE_ENV=production webpack",
-    "test": "jest typescript_tests"
+    "test": "jest ts/tests"
   },
   "author": "Masashi Shibata",
   "license": "MIT",
diff --git a/optuna_dashboard/ts/hooks/useParamImportance.ts b/optuna_dashboard/ts/hooks/useParamImportance.ts
index 173f1d32..791644ca 100644
--- a/optuna_dashboard/ts/hooks/useParamImportance.ts
+++ b/optuna_dashboard/ts/hooks/useParamImportance.ts
@@ -1,6 +1,6 @@
 import { useEffect } from "react"
 import { useSnackbar } from "notistack"
-import { getParamImportances } from "../../ts/apiClient"
+import { getParamImportances } from "../apiClient"
 import { useQuery } from "@tanstack/react-query"
 import { AxiosError } from "axios"
 
diff --git a/optuna_dashboard/ts/tests/DataGrid.test.tsx b/optuna_dashboard/ts/tests/DataGrid.test.tsx
index 6d13deb7..809c3c42 100644
--- a/optuna_dashboard/ts/tests/DataGrid.test.tsx
+++ b/optuna_dashboard/ts/tests/DataGrid.test.tsx
@@ -2,10 +2,7 @@ import React from "react"
 global.URL.createObjectURL = jest.fn()
 
 import { cleanup, render } from "@testing-library/react"
-import {
-  DataGrid,
-  DataGridColumn,
-} from "../optuna_dashboard/ts/components/DataGrid"
+import { DataGrid, DataGridColumn } from "../components/DataGrid"
 
 afterEach(cleanup)
 
diff --git a/optuna_dashboard/ts/tests/searchSpace.test.ts b/optuna_dashboard/ts/tests/searchSpace.test.ts
index fa36be7c..0e48e0c9 100644
--- a/optuna_dashboard/ts/tests/searchSpace.test.ts
+++ b/optuna_dashboard/ts/tests/searchSpace.test.ts
@@ -1,4 +1,4 @@
-import { mergeUnionSearchSpace } from "../optuna_dashboard/ts/searchSpace"
+import { mergeUnionSearchSpace } from "../searchSpace"
 
 global.URL.createObjectURL = jest.fn()
 
diff --git a/optuna_dashboard/tsconfig.json b/optuna_dashboard/tsconfig.json
index 995da2dd..c05b9241 100644
--- a/optuna_dashboard/tsconfig.json
+++ b/optuna_dashboard/tsconfig.json
@@ -6,7 +6,7 @@
     "noUnusedLocals": true,
     "noImplicitThis": true,
     "alwaysStrict": true,
-    "outDir": "./optuna_dashboard/public/",
+    "outDir": "./public/",
     "paths": {
       "plotly.js-dist-min": ["node_modules/@types/plotly.js"]
     },
@@ -21,11 +21,11 @@
     "strict": true
   },
   "files": [
-    "./optuna_dashboard/ts/index.tsx"
+    "./ts/index.tsx"
   ],
   "include": [
-    "./optuna_dashboard/ts/types/**/*",
-    "./typescript_tests/**/*"
+    "./ts/types/**/*",
+    "./ts/tests/**/*"
   ],
   "types": ["node"]
 }
diff --git a/optuna_dashboard/webpack.config.js b/optuna_dashboard/webpack.config.js
index 41abca1b..56f989ad 100644
--- a/optuna_dashboard/webpack.config.js
+++ b/optuna_dashboard/webpack.config.js
@@ -28,9 +28,9 @@ const typeScriptLoader =
 
 var config = {
   mode,
-  entry: [__dirname + "/optuna_dashboard/ts/index.tsx"],
+  entry: [__dirname + "/ts/index.tsx"],
   output: {
-    path: __dirname + "/optuna_dashboard/public/",
+    path: __dirname + "/public/",
     filename: "bundle.js",
     publicPath: "/public/",
   },