diff --git a/resources/assets/js/components/TagInput.vue b/resources/assets/js/components/TagInput.vue
index 5dd2bad..9fad41f 100644
--- a/resources/assets/js/components/TagInput.vue
+++ b/resources/assets/js/components/TagInput.vue
@@ -41,7 +41,7 @@ export default class TagInput extends Vue {
                 case 'Enter':
                 case ' ':
                     if ((event as any).isComposing !== true) {
-                        this.tags.push(this.buffer.trim());
+                        this.tags.push(this.buffer.trim().replace(/\s+/g, '_'));
                         this.buffer = '';
                     }
                     event.preventDefault();
@@ -49,7 +49,7 @@ export default class TagInput extends Vue {
                 case 'Unidentified':
                     // 実際にテキストボックスに入力されている文字を見に行く (フォールバック処理)
                     if (event.srcElement && (event.srcElement as HTMLInputElement).value.slice(-1) == ' ') {
-                        this.tags.push(this.buffer.trim());
+                        this.tags.push(this.buffer.trim().replace(/\s+/g, '_'));
                         this.buffer = '';
                         event.preventDefault();
                     }