diff --git a/src/app/not-found.module.scss b/src/app/not-found.module.scss
new file mode 100644
index 0000000..2ad4dc0
--- /dev/null
+++ b/src/app/not-found.module.scss
@@ -0,0 +1,28 @@
+@use 'src/app/variables';
+
+.main {
+  padding-top: 72px;
+  background-color: variables.$background-color;
+}
+
+.container {
+  display: flex;
+  flex-direction: column;
+  height: calc(100vh - 400px);
+  background-color: variables.$background-color;
+}
+
+.box {
+  margin: 64px;
+  text-align: center;
+}
+
+.text {
+  font-size: 24px;
+  font-weight: bold;
+}
+
+.link {
+  font-size: 16px;
+  color: variables.$span-color;
+}
\ No newline at end of file
diff --git a/src/app/not-found.tsx b/src/app/not-found.tsx
index 0af9ff8..b2aebbe 100644
--- a/src/app/not-found.tsx
+++ b/src/app/not-found.tsx
@@ -1,4 +1,6 @@
 import type { Metadata } from 'next';
+import Link from 'next/link';
+import style from './not-found.module.scss';
 
 export const metadata: Metadata = {
   title: '404 Not Found',
@@ -6,8 +8,16 @@ export const metadata: Metadata = {
 
 export default function Custom404() {
   return (
-    <div>
-      <h1>404 - Page Not Found</h1>
+    <div className={style.container}>
+      <main className={style.main}>
+        <div className={style.box}>
+          <p className={style.text}>404 - Page Not Found</p>
+          <p className={style.text}>お探しのページは見つかりませんでした</p>
+          <Link href='/' className={style.link}>
+            トップページに戻る
+          </Link>
+        </div>
+      </main>
     </div>
   );
 }