diff --git a/app/controllers/words_controller.rb b/app/controllers/words_controller.rb
index 3d83a42..adec161 100644
--- a/app/controllers/words_controller.rb
+++ b/app/controllers/words_controller.rb
@@ -89,6 +89,32 @@ def destroy
     end
   end
 
+  # POST /words/ai_generate
+  def ai_generate
+    title = params[:title]
+    return render json: { success: false, error: "Title is required" }, status: :bad_request if title.blank?
+    
+    result = AiContentGenerator.new(title).call
+    
+    respond_to do |format|
+      if result.success?
+        format.json { 
+          render json: { 
+            success: true, 
+            content: result.content 
+          } 
+        }
+      else
+        format.json { 
+          render json: { 
+            success: false, 
+            error: result.error 
+          }, status: :unprocessable_entity 
+        }
+      end
+    end
+  end
+
   # POST /words/1/ai_edit
   def ai_edit
     result = AiContentGenerator.new(@word.title).call
diff --git a/app/views/layouts/application.html.slim b/app/views/layouts/application.html.slim
index 63a4008..95770db 100644
--- a/app/views/layouts/application.html.slim
+++ b/app/views/layouts/application.html.slim
@@ -224,6 +224,55 @@ html lang="en"
       |   });
       | }
       | 
+      | function handleAiEditNew() {
+      |   const btn = document.getElementById('ai-edit-btn');
+      |   const trixEditor = document.querySelector('trix-editor');
+      |   const titleInput = document.querySelector('input[name="word[title]"]');
+      |   
+      |   if (!trixEditor) {
+      |     alert('エディターが見つかりません');
+      |     return;
+      |   }
+      |   
+      |   if (!titleInput || !titleInput.value.trim()) {
+      |     alert('まずタイトルを入力してください');
+      |     if (titleInput) titleInput.focus();
+      |     return;
+      |   }
+      |   
+      |   const originalText = btn.innerHTML;
+      |   btn.disabled = true;
+      |   btn.innerHTML = '🔄 生成中...';
+      |   
+      |   fetch('/ai_generate', {
+      |     method: 'POST',
+      |     headers: {
+      |       'Content-Type': 'application/json',
+      |       'X-CSRF-Token': document.querySelector('meta[name="csrf-token"]').getAttribute('content')
+      |     },
+      |     body: JSON.stringify({
+      |       title: titleInput.value.trim()
+      |     })
+      |   })
+      |   .then(response => response.json())
+      |   .then(data => {
+      |     if (data.success) {
+      |       trixEditor.value = data.content;
+      |       showMessage('AIによるコンテンツ生成が完了しました', 'success');
+      |     } else {
+      |       showMessage('エラー: ' + data.error, 'error');
+      |     }
+      |   })
+      |   .catch(error => {
+      |     console.error('Error:', error);
+      |     showMessage('ネットワークエラーが発生しました', 'error');
+      |   })
+      |   .finally(() => {
+      |     btn.disabled = false;
+      |     btn.innerHTML = originalText;
+      |   });
+      | }
+      | 
       | function showMessage(message, type) {
       |   const existingMessage = document.querySelector('.ai-edit-message');
       |   if (existingMessage) {
diff --git a/app/views/words/_form.html.slim b/app/views/words/_form.html.slim
index 9f46b0c..4febacc 100644
--- a/app/views/words/_form.html.slim
+++ b/app/views/words/_form.html.slim
@@ -33,11 +33,10 @@
         .mb-4
           .d-flex.justify-content-between.align-items-center.mb-2
             = f.label :body, "Content", class: 'form-label mb-0'
-            - if word.persisted?
-              = button_tag type: 'button', class: 'btn btn-outline-primary btn-sm ms-3', id: 'ai-edit-btn', 
-                data: { word_id: word.id }, 
-                onclick: "handleAiEdit(#{word.id})" do
-                | 🤖 AIで本文生成
+            = button_tag type: 'button', class: 'btn btn-outline-primary btn-sm ms-3', id: 'ai-edit-btn', 
+              data: { word_id: word.persisted? ? word.id : nil }, 
+              onclick: word.persisted? ? "handleAiEdit(#{word.id})" : "handleAiEditNew()" do
+              | 🤖 AIで本文生成
           = f.rich_text_area :body, class: 'form-control rich-text-editor'
           .form-text Use the toolbar above to format your content with rich text.
 
diff --git a/config/routes.rb b/config/routes.rb
index 8cdefbd..cfa3dd9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -56,6 +56,9 @@
   get '/tag::tag_list', to: 'words#tag', as: 'word_tag'
 
   resources :words, path: '/' do
+    collection do
+      post :ai_generate
+    end
     member do
       post :ai_edit
     end