diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 9d01031..f17fb27 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,5 +1,4 @@
 import { Link, Route, Routes, useLocation } from "react-router-dom";
-import CategoryList from "./components/CategoryList";
 import EpisodeDetail from "./components/EpisodeDetail";
 import EpisodeList from "./components/EpisodeList";
 import FeedDetail from "./components/FeedDetail";
@@ -12,7 +11,6 @@ function App() {
   const isMainPage = [
     "/",
     "/feeds",
-    "/categories",
     "/feed-requests",
     "/rss-endpoints",
   ].includes(location.pathname);
@@ -41,12 +39,6 @@ function App() {
             >
               フィード一覧
             </Link>
-            <Link
-              to="/categories"
-              className={`tab ${location.pathname === "/categories" ? "active" : ""}`}
-            >
-              カテゴリ一覧
-            </Link>
             <Link
               to="/feed-requests"
               className={`tab ${location.pathname === "/feed-requests" ? "active" : ""}`}
@@ -67,7 +59,6 @@ function App() {
         <Routes>
           <Route path="/" element={<EpisodeList />} />
           <Route path="/feeds" element={<FeedList />} />
-          <Route path="/categories" element={<CategoryList />} />
           <Route path="/feed-requests" element={<FeedManager />} />
           <Route path="/rss-endpoints" element={<RSSEndpoints />} />
           <Route path="/episode/:episodeId" element={<EpisodeDetail />} />
diff --git a/frontend/src/components/CategoryList.tsx b/frontend/src/components/CategoryList.tsx
deleted file mode 100644
index b6b5e8a..0000000
--- a/frontend/src/components/CategoryList.tsx
+++ /dev/null
@@ -1,392 +0,0 @@
-import { useEffect, useState } from "react";
-import { Link } from "react-router-dom";
-
-interface Feed {
-  id: string;
-  url: string;
-  title?: string;
-  description?: string;
-  category?: string;
-  lastUpdated?: string;
-  createdAt: string;
-  active: boolean;
-}
-
-interface CategoryGroup {
-  [category: string]: Feed[];
-}
-
-function CategoryList() {
-  const [groupedFeeds, setGroupedFeeds] = useState<CategoryGroup>({});
-  const [selectedCategory, setSelectedCategory] = useState<string | null>(null);
-  const [filteredFeeds, setFilteredFeeds] = useState<Feed[]>([]);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState<string | null>(null);
-
-  useEffect(() => {
-    fetchCategoriesAndFeeds();
-  }, []);
-
-  useEffect(() => {
-    if (selectedCategory && groupedFeeds[selectedCategory]) {
-      setFilteredFeeds(groupedFeeds[selectedCategory]);
-    } else {
-      setFilteredFeeds([]);
-    }
-  }, [selectedCategory, groupedFeeds]);
-
-  const fetchCategoriesAndFeeds = async () => {
-    try {
-      setLoading(true);
-      setError(null);
-
-      // Fetch grouped feeds
-      const [groupedResponse, categoriesResponse] = await Promise.all([
-        fetch("/api/feeds/grouped-by-category"),
-        fetch("/api/categories"),
-      ]);
-
-      if (!groupedResponse.ok || !categoriesResponse.ok) {
-        throw new Error("カテゴリデータの取得に失敗しました");
-      }
-
-      const groupedData = await groupedResponse.json();
-      await categoriesResponse.json();
-
-      setGroupedFeeds(groupedData.groupedFeeds || {});
-    } catch (err) {
-      console.error("Category fetch error:", err);
-      setError(err instanceof Error ? err.message : "エラーが発生しました");
-    } finally {
-      setLoading(false);
-    }
-  };
-
-  const formatDate = (dateString: string) => {
-    return new Date(dateString).toLocaleString("ja-JP");
-  };
-
-  const getFeedCount = (category: string) => {
-    return groupedFeeds[category]?.length || 0;
-  };
-
-  if (loading) {
-    return <div className="loading">読み込み中...</div>;
-  }
-
-  if (error) {
-    return <div className="error">{error}</div>;
-  }
-
-  const availableCategories = Object.keys(groupedFeeds).filter(
-    (category) => groupedFeeds[category] && groupedFeeds[category].length > 0,
-  );
-
-  if (availableCategories.length === 0) {
-    return (
-      <div className="empty-state">
-        <p>カテゴリ別のフィードがありません</p>
-        <p>
-          フィードにカテゴリが設定されていないか、アクティブなフィードがない可能性があります
-        </p>
-        <button
-          className="btn btn-secondary"
-          onClick={fetchCategoriesAndFeeds}
-          style={{ marginTop: "10px" }}
-        >
-          再読み込み
-        </button>
-      </div>
-    );
-  }
-
-  return (
-    <div>
-      <div
-        style={{
-          marginBottom: "20px",
-          display: "flex",
-          justifyContent: "space-between",
-          alignItems: "center",
-        }}
-      >
-        <h2>カテゴリ一覧 ({availableCategories.length}件)</h2>
-        <button className="btn btn-secondary" onClick={fetchCategoriesAndFeeds}>
-          更新
-        </button>
-      </div>
-
-      {!selectedCategory ? (
-        <div className="category-grid">
-          {availableCategories.map((category) => (
-            <div key={category} className="category-card">
-              <div className="category-header">
-                <h3
-                  className="category-title"
-                  onClick={() => setSelectedCategory(category)}
-                >
-                  {category}
-                </h3>
-                <div className="category-stats">
-                  <span className="feed-count">
-                    {getFeedCount(category)} フィード
-                  </span>
-                </div>
-              </div>
-
-              <div className="category-feeds-preview">
-                {groupedFeeds[category]?.slice(0, 3).map((feed) => (
-                  <div key={feed.id} className="feed-preview">
-                    <Link
-                      to={`/feeds/${feed.id}`}
-                      className="feed-preview-link"
-                    >
-                      {feed.title || feed.url}
-                    </Link>
-                  </div>
-                ))}
-                {getFeedCount(category) > 3 && (
-                  <div className="more-feeds">
-                    他 {getFeedCount(category) - 3} フィード...
-                  </div>
-                )}
-              </div>
-
-              <div className="category-actions">
-                <button
-                  className="btn btn-primary"
-                  onClick={() => setSelectedCategory(category)}
-                >
-                  詳細を見る
-                </button>
-              </div>
-            </div>
-          ))}
-        </div>
-      ) : (
-        <div>
-          <div className="category-detail-header">
-            <button
-              className="btn btn-secondary"
-              onClick={() => setSelectedCategory(null)}
-            >
-              ← カテゴリ一覧に戻る
-            </button>
-            <h3>カテゴリ: {selectedCategory}</h3>
-            <p>{filteredFeeds.length} フィード</p>
-          </div>
-
-          <div className="feed-grid">
-            {filteredFeeds.map((feed) => (
-              <div key={feed.id} className="feed-card">
-                <div className="feed-card-header">
-                  <h4 className="feed-title">
-                    <Link to={`/feeds/${feed.id}`} className="feed-link">
-                      {feed.title || feed.url}
-                    </Link>
-                  </h4>
-                  <div className="feed-url">
-                    <a
-                      href={feed.url}
-                      target="_blank"
-                      rel="noopener noreferrer"
-                    >
-                      {feed.url}
-                    </a>
-                  </div>
-                </div>
-
-                {feed.description && (
-                  <div className="feed-description">{feed.description}</div>
-                )}
-
-                <div className="feed-meta">
-                  <div>作成日: {formatDate(feed.createdAt)}</div>
-                  {feed.lastUpdated && (
-                    <div>最終更新: {formatDate(feed.lastUpdated)}</div>
-                  )}
-                </div>
-
-                <div className="feed-actions">
-                  <Link to={`/feeds/${feed.id}`} className="btn btn-primary">
-                    エピソード一覧を見る
-                  </Link>
-                </div>
-              </div>
-            ))}
-          </div>
-        </div>
-      )}
-
-      <style>{`
-        .category-grid {
-          display: grid;
-          grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
-          gap: 20px;
-          margin-bottom: 30px;
-        }
-
-        .category-card {
-          border: 1px solid #e9ecef;
-          border-radius: 12px;
-          padding: 20px;
-          background: white;
-          box-shadow: 0 2px 8px rgba(0,0,0,0.1);
-          transition: transform 0.2s ease, box-shadow 0.2s ease;
-        }
-
-        .category-card:hover {
-          transform: translateY(-2px);
-          box-shadow: 0 4px 16px rgba(0,0,0,0.15);
-        }
-
-        .category-header {
-          margin-bottom: 15px;
-        }
-
-        .category-title {
-          margin: 0 0 8px 0;
-          font-size: 20px;
-          color: #2c3e50;
-          cursor: pointer;
-          transition: color 0.2s ease;
-        }
-
-        .category-title:hover {
-          color: #007bff;
-        }
-
-        .category-stats {
-          display: flex;
-          gap: 15px;
-          font-size: 14px;
-          color: #6c757d;
-        }
-
-        .feed-count {
-          background: #f8f9fa;
-          padding: 4px 8px;
-          border-radius: 4px;
-        }
-
-        .category-feeds-preview {
-          margin-bottom: 15px;
-        }
-
-        .feed-preview {
-          margin-bottom: 6px;
-          font-size: 14px;
-        }
-
-        .feed-preview-link {
-          color: #007bff;
-          text-decoration: none;
-          display: block;
-          white-space: nowrap;
-          overflow: hidden;
-          text-overflow: ellipsis;
-        }
-
-        .feed-preview-link:hover {
-          text-decoration: underline;
-        }
-
-        .more-feeds {
-          font-size: 12px;
-          color: #6c757d;
-          font-style: italic;
-        }
-
-        .category-actions {
-          text-align: right;
-        }
-
-        .category-detail-header {
-          margin-bottom: 25px;
-          padding-bottom: 15px;
-          border-bottom: 1px solid #e9ecef;
-        }
-
-        .category-detail-header h3 {
-          margin: 10px 0 5px 0;
-          color: #2c3e50;
-        }
-
-        .category-detail-header p {
-          margin: 0;
-          color: #6c757d;
-        }
-
-        .feed-grid {
-          display: grid;
-          grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
-          gap: 20px;
-        }
-
-        .feed-card {
-          border: 1px solid #e9ecef;
-          border-radius: 8px;
-          padding: 20px;
-          background: white;
-          box-shadow: 0 2px 4px rgba(0,0,0,0.1);
-        }
-
-        .feed-card-header {
-          margin-bottom: 15px;
-        }
-
-        .feed-title {
-          margin: 0 0 8px 0;
-          font-size: 16px;
-        }
-
-        .feed-link {
-          text-decoration: none;
-          color: #007bff;
-        }
-
-        .feed-link:hover {
-          text-decoration: underline;
-        }
-
-        .feed-url {
-          font-size: 12px;
-          color: #666;
-          word-break: break-all;
-        }
-
-        .feed-url a {
-          color: #666;
-          text-decoration: none;
-        }
-
-        .feed-url a:hover {
-          color: #007bff;
-        }
-
-        .feed-description {
-          margin-bottom: 15px;
-          color: #333;
-          line-height: 1.5;
-          font-size: 14px;
-        }
-
-        .feed-meta {
-          margin-bottom: 15px;
-          font-size: 12px;
-          color: #666;
-        }
-
-        .feed-meta div {
-          margin-bottom: 4px;
-        }
-
-        .feed-actions {
-          text-align: right;
-        }
-      `}</style>
-    </div>
-  );
-}
-
-export default CategoryList;