diff --git a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryPageFragment.java b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryPageFragment.java
index 1ae7481d..2a00bdb0 100644
--- a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryPageFragment.java
+++ b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryPageFragment.java
@@ -319,6 +319,8 @@ public class LibraryPageFragment extends Fragment {
             } else {
                 toolbar.setNavigationIcon(null);
             }
+
+            if (this.folderId == null) toolbar.getMenu().findItem(R.id.menu_item_delete_folder).setVisible(false); // ルートフォルダの場合は削除ボタンを非表示にする
             toolbar.setTitle(title);
             toolbar.getMenu().clear();
             toolbar.inflateMenu(R.menu.dir_menu);