diff --git a/jig-core/src/main/resources/templates/assets/glossary.js b/jig-core/src/main/resources/templates/assets/glossary.js
index a41cd0b9f..d40726f33 100644
--- a/jig-core/src/main/resources/templates/assets/glossary.js
+++ b/jig-core/src/main/resources/templates/assets/glossary.js
@@ -95,6 +95,10 @@ function getGlossaryData() {
     return glossaryData.terms ?? [];
 }
 
+function buildTermAnchorId(term, index) {
+    return term.fqn || `term-${index}`;
+}
+
 function escapeCsvValue(value) {
     const text = String(value ?? "")
         .replace(/\r\n/g, "\n")
@@ -128,19 +132,35 @@ function downloadCsv(text, filename) {
     URL.revokeObjectURL(url);
 }
 
+function renderTermSidebar(terms) {
+    const list = document.getElementById("term-sidebar-list");
+    if (!list) return;
+
+    list.innerHTML = "";
+    if (terms.length === 0) return;
+
+    const fragment = document.createDocumentFragment();
+    terms.forEach((term, index) => {
+        const link = document.createElement("a");
+        link.className = "term-sidebar__item";
+        link.href = `#${buildTermAnchorId(term, index)}`;
+        link.textContent = term.title || "";
+        fragment.appendChild(link);
+    });
+    list.appendChild(fragment);
+}
+
 function renderGlossaryTerms(terms) {
     const list = document.getElementById("term-list");
     if (!list) return;
     list.innerHTML = "";
 
     const fragment = document.createDocumentFragment();
-    terms.forEach(term => {
+    terms.forEach((term, index) => {
         const article = document.createElement("article");
         article.className = "term";
-        if (term.fqn) {
-            // 他ドキュメントからのリンク用にFQNをIDとして設定する
-            article.id = term.fqn;
-        }
+        // 他ドキュメントからのリンク用にFQNをIDとして設定する
+        article.id = buildTermAnchorId(term, index);
 
         const title = document.createElement("h2");
         title.className = "term-title";
@@ -193,6 +213,7 @@ function renderMarkdownDescriptions() {
 function renderFilteredTerms(terms, controls) {
     const filteredTerms = getFilteredTerms(terms, controls);
     const sortedTerms = sortTerms(filteredTerms, controls.sortOrder?.value);
+    renderTermSidebar(sortedTerms);
     renderGlossaryTerms(sortedTerms);
     renderMarkdownDescriptions();
 }
@@ -244,8 +265,10 @@ if (typeof module !== "undefined" && module.exports) {
         sortTerms,
         getFilteredTerms,
         getGlossaryData,
+        buildTermAnchorId,
         escapeCsvValue,
         buildGlossaryCsv,
+        renderTermSidebar,
         renderGlossaryTerms,
         renderFilteredTerms,
         renderMarkdownDescriptions,
diff --git a/jig-core/src/main/resources/templates/assets/style.css b/jig-core/src/main/resources/templates/assets/style.css
index 26f699464..a9d886a1f 100644
--- a/jig-core/src/main/resources/templates/assets/style.css
+++ b/jig-core/src/main/resources/templates/assets/style.css
@@ -267,6 +267,63 @@ label {
     padding: 5px 0;
 }
 
+.glossary .glossary-content {
+    display: grid;
+    grid-template-columns: minmax(180px, 260px) 1fr;
+    gap: 16px;
+    width: 90%;
+    max-width: 1200px;
+    margin: 0 auto;
+}
+
+.glossary .term-sidebar {
+    border: 1px solid #ccc;
+    border-radius: 6px;
+    padding: 12px 14px;
+    background-color: #fafafa;
+    height: fit-content;
+    position: sticky;
+    top: 16px;
+    align-self: start;
+    max-height: calc(100vh - 32px);
+    overflow: auto;
+}
+
+.glossary .term-sidebar h2 {
+    font-size: 16px;
+    margin: 0 0 8px 0;
+}
+
+.glossary .term-sidebar__list {
+    display: block;
+}
+
+.glossary .term-sidebar__item {
+    display: block;
+    padding: 3px 0;
+    color: #1a1a1a;
+    text-decoration: none;
+}
+
+.glossary .term-sidebar__item:hover {
+    text-decoration: underline;
+}
+
+.glossary .term-list {
+    width: 100%;
+}
+
+@media (max-width: 900px) {
+    .glossary .glossary-content {
+        grid-template-columns: 1fr;
+    }
+
+    .glossary .term-sidebar {
+        position: static;
+        max-height: none;
+    }
+}
+
 .glossary details.controls > div,
 .glossary details.controls > label {
     display: block;
diff --git a/jig-core/src/main/resources/templates/glossary.html b/jig-core/src/main/resources/templates/glossary.html
index a6f957f86..a747676d2 100644
--- a/jig-core/src/main/resources/templates/glossary.html
+++ b/jig-core/src/main/resources/templates/glossary.html
@@ -41,7 +41,13 @@
         </div>
     </details>
 
-    <section class="term-list" id="term-list"></section>
+    <div class="glossary-content">
+        <aside class="term-sidebar" aria-label="用語一覧">
+            <h2>用語一覧</h2>
+            <nav id="term-sidebar-list" class="term-sidebar__list"></nav>
+        </aside>
+        <section class="term-list" id="term-list"></section>
+    </div>
 
 </main>