diff --git a/src/api/boardApi.js b/src/api/boardApi.js
index 45646d6..107ccf4 100644
--- a/src/api/boardApi.js
+++ b/src/api/boardApi.js
@@ -38,8 +38,8 @@ export const boardApi = {
   tags() {
     return http.get('/board/tags')
   },
-  tagGroups() {
-    return http.get('/board/tag-groups')
+  tagGroups(category) {
+    return http.get('/board/tag-groups', { params: { category: category || undefined } })
   },
   addComment(id, content) {
     return http.post(`/board/posts/${id}/comments`, { content })
diff --git a/src/views/admin/TagAdminView.vue b/src/views/admin/TagAdminView.vue
index b523961..273b8e3 100644
--- a/src/views/admin/TagAdminView.vue
+++ b/src/views/admin/TagAdminView.vue
@@ -2,6 +2,7 @@
 import { onMounted, reactive, ref } from 'vue'
 import { adminApi } from '@/api/adminApi'
 import { useDialog } from '@/composables/dialog'
+import { BOARDS } from '@/constants/boards'
 import IconBtn from '@/components/ui/IconBtn.vue'
 
 const dialog = useDialog()
@@ -11,18 +12,17 @@ const error = ref(null)
 
 const newCategoryName = ref('')
 const newTag = reactive({}) // { [categoryId]: '입력값' }
-const boardCategoryId = ref('') // 게시판에서 사용할 카테고리 ('' = 제한 없음)
 
 async function load() {
   loading.value = true
   error.value = null
   try {
-    categories.value = await adminApi.categories()
-    categories.value.forEach((c) => {
+    const list = await adminApi.categories()
+    list.forEach((c) => {
+      if (!Array.isArray(c.boards)) c.boards = []
       if (newTag[c.id] === undefined) newTag[c.id] = ''
     })
-    const setting = await adminApi.getBoardSetting()
-    boardCategoryId.value = setting.tagCategoryId ?? ''
+    categories.value = list
   } catch (e) {
     error.value = e.response?.data?.message || '불러오지 못했습니다.'
   } finally {
@@ -30,21 +30,18 @@ async function load() {
   }
 }
 
-async function saveBoardSetting() {
-  try {
-    const id = boardCategoryId.value === '' ? null : Number(boardCategoryId.value)
-    await adminApi.setBoardSetting(id)
-    alert('게시판 사용 카테고리를 저장했습니다.')
-  } catch (e) {
-    alert(e.response?.data?.message || '저장 실패')
-  }
+// 카테고리의 게시판 매핑 토글
+function toggleBoard(cat, key) {
+  const i = cat.boards.indexOf(key)
+  if (i >= 0) cat.boards.splice(i, 1)
+  else cat.boards.push(key)
 }
 
 async function addCategory() {
   const name = newCategoryName.value.trim()
   if (!name) return
   try {
-    await adminApi.createCategory({ name, sortOrder: categories.value.length })
+    await adminApi.createCategory({ name, sortOrder: categories.value.length, boards: [] })
     newCategoryName.value = ''
     await load()
   } catch (e) {
@@ -56,7 +53,8 @@ async function saveCategory(cat) {
   const name = (cat.name || '').trim()
   if (!name) return
   try {
-    await adminApi.updateCategory(cat.id, { name, sortOrder: cat.sortOrder })
+    await adminApi.updateCategory(cat.id, { name, sortOrder: cat.sortOrder, boards: cat.boards })
+    alert('저장했습니다.')
     await load()
   } catch (e) {
     alert(e.response?.data?.message || '카테고리 수정 실패')
@@ -100,15 +98,7 @@ onMounted(load)
 
 <template>
   <section class="tag-admin">
-    <div class="board-setting">
-      <label>게시판 사용 카테고리</label>
-      <select v-model="boardCategoryId">
-        <option value="">전체 허용 (제한 없음)</option>
-        <option v-for="c in categories" :key="c.id" :value="c.id">{{ c.name }}</option>
-      </select>
-      <IconBtn icon="check" title="저장" variant="primary" @click="saveBoardSetting" />
-      <span class="hint">선택 시 글쓰기에서 해당 카테고리의 태그만 사용할 수 있습니다.</span>
-    </div>
+    <p class="page-hint">각 태그 그룹을 사용할 게시판을 지정하세요. 선택한 게시판의 글쓰기에서만 그 그룹 태그가 노출됩니다. (선택 없으면 전체 게시판)</p>
 
     <form class="new-category" @submit.prevent="addCategory">
       <input v-model="newCategoryName" type="text" placeholder="새 카테고리 이름 (예: 게시판, 게시판2)" />
@@ -121,10 +111,19 @@ onMounted(load)
     <div v-for="cat in categories" :key="cat.id" class="category-card">
       <div class="cat-head">
         <input v-model="cat.name" class="cat-name" @keyup.enter="saveCategory(cat)" />
-        <IconBtn icon="check" title="이름 저장" @click="saveCategory(cat)" />
+        <IconBtn icon="check" title="저장" @click="saveCategory(cat)" />
         <IconBtn icon="trash" title="카테고리 삭제" variant="danger" @click="removeCategory(cat)" />
       </div>
 
+      <div class="board-map">
+        <span class="bm-label">사용 게시판</span>
+        <label v-for="b in BOARDS" :key="b.key" class="bm-check">
+          <input type="checkbox" :checked="cat.boards.includes(b.key)" @change="toggleBoard(cat, b.key)" />
+          {{ b.label }}
+        </label>
+        <span v-if="!cat.boards.length" class="bm-all">전체</span>
+      </div>
+
       <div class="tag-list">
         <span v-for="t in cat.tags" :key="t.id" class="tag-chip">
           {{ t.name }}
@@ -171,31 +170,40 @@ button.danger {
   border-color: #c0392b;
   color: #c0392b;
 }
-.board-setting {
+.page-hint {
+  font-size: 0.85rem;
+  opacity: 0.7;
+  margin-bottom: 1rem;
+  line-height: 1.5;
+}
+.board-map {
   display: flex;
   align-items: center;
-  gap: 0.5rem;
+  gap: 0.75rem;
   flex-wrap: wrap;
-  padding: 0.75rem;
-  margin-bottom: 1.25rem;
-  border: 1px solid var(--color-border);
-  border-radius: 6px;
-  background: var(--color-background-soft);
+  padding: 0.5rem 0 0.75rem;
+  margin-bottom: 0.5rem;
+  border-bottom: 1px dashed var(--color-border);
 }
-.board-setting label {
+.bm-label {
+  font-size: 0.82rem;
   font-weight: 600;
+  opacity: 0.8;
 }
-.board-setting select {
-  padding: 0.4rem 0.6rem;
-  border: 1px solid var(--color-border);
-  border-radius: 4px;
-  background: var(--color-background);
-  color: var(--color-text);
+.bm-check {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+  font-size: 0.85rem;
+  cursor: pointer;
 }
-.board-setting .hint {
-  font-size: 0.8rem;
-  opacity: 0.65;
-  flex-basis: 100%;
+.bm-check input {
+  width: auto;
+  cursor: pointer;
+}
+.bm-all {
+  font-size: 0.78rem;
+  opacity: 0.55;
 }
 .new-category {
   display: flex;
diff --git a/src/views/board/BoardWriteView.vue b/src/views/board/BoardWriteView.vue
index c639437..ee10696 100644
--- a/src/views/board/BoardWriteView.vue
+++ b/src/views/board/BoardWriteView.vue
@@ -37,7 +37,7 @@ function toggleTag(id) {
 
 async function loadTagGroups() {
   try {
-    tagGroups.value = await boardApi.tagGroups()
+    tagGroups.value = await boardApi.tagGroups(category)
   } catch {
     tagGroups.value = []
   }