diff --git a/webroot/css/style.css b/webroot/css/style.css
index 48f8df0b..876c3f8f 100644
--- a/webroot/css/style.css
+++ b/webroot/css/style.css
@@ -504,3 +504,41 @@ ul.nav-pills {
 .popover {
 	min-width: 274px;
 }
+
+/**
+ * ドロップダウン枠内文字表示制限
+ */
+.nc-category-ellipsis {
+	max-width: 180px;
+	overflow: hidden;
+	white-space: nowrap;
+	text-overflow: ellipsis;
+}
+.nc-drop-down-ellipsis {
+	min-width: 5px;
+	max-width: 180px;
+	overflow: hidden;
+	white-space: nowrap;
+	text-overflow: ellipsis;
+	margin-right: 3px;
+}
+@media screen and (min-width: 768px) {
+	.nc-drop-down-ellipsis {
+		min-width: 5px;
+		max-width: 380px;
+		overflow: hidden;
+		white-space: nowrap;
+		text-overflow: ellipsis;
+		margin-right: 3px;
+	}
+}
+@media screen and (min-width: 1200px) {
+	.nc-drop-down-ellipsis {
+		min-width: 5px;
+		max-width: 480px;
+		overflow: hidden;
+		white-space: nowrap;
+		text-overflow: ellipsis;
+		margin-right: 3px;
+	}
+}
\ No newline at end of file