added

src/app/share/side-menu/app-side-menu.html

         ホーム
       </a>
 
-      <a routerLink="/danka-list" routerLinkActive="active" class="menu-button">
+      <a routerLink="/danka-list" routerLinkActive="active">
         檀家
       </a>
 
         まとめて検索
       </a>
 
-<!--  ユーザー数が増えた際に実装    -->
-<!--      <a routerLink="/user-setting" routerLinkActive="active" class="menu-button">-->
-<!--        利用者設定-->
-<!--      </a>-->
+      <!--  ユーザー数が増えた際に実装    -->
+      <!--      <a routerLink="/user-setting" routerLinkActive="active" class="menu-button">-->
+      <!--        利用者設定-->
+      <!--      </a>-->
     </nav>
   </div>
-</aside>
+</aside>

src/app/share/side-menu/app-side-menu.ts

 import { Component } from '@angular/core';
-import { RouterLink, RouterLinkActive } from '@angular/router';
+import { Router, RouterModule } from '@angular/router';
 
 @Component({
   selector: 'app-side-menu',
-  imports: [RouterLink, RouterLinkActive],
+  standalone: true,
+  imports: [RouterModule],
   templateUrl: './app-side-menu.html',
   styleUrl: './app-side-menu.scss',
 })
-export class AppSideMenu {}
+export class AppSideMenu {
+
+  constructor(public router: Router) {}
+
+  isDankaActive(): boolean {
+    return this.router.url.includes('danka');
+  }
+}