diff --git a/docs/ja/perception/label.md b/docs/ja/perception/label.md
index a80723d8..7438eb06 100644
--- a/docs/ja/perception/label.md
+++ b/docs/ja/perception/label.md
@@ -12,6 +12,8 @@
 | `AutowareLabel.TRUCK`      |   "truck"    | truck                                  |
 |                            |              | TRUCK                                  |
 |                            |              | vehicle.truck                          |
+|                            |              | trailer                                |
+|                            |              | TRAILER                                |
 |                            |              | vehicle.trailer                        |
 | `AutowareLabel.BUS`        |    "bus"     | bus                                    |
 |                            |              | BUS                                    |
@@ -61,6 +63,8 @@
 |                            |              | truck                                  |
 |                            |              | TRUCK                                  |
 |                            |              | vehicle.truck                          |
+|                            |              | trailer                                |
+|                            |              | TRAILER                                |
 |                            |              | vehicle.trailer                        |
 |                            |              | bus                                    |
 |                            |              | BUS                                    |
diff --git a/perception_eval/perception_eval/common/label.py b/perception_eval/perception_eval/common/label.py
index e99689dc..4c9503b8 100644
--- a/perception_eval/perception_eval/common/label.py
+++ b/perception_eval/perception_eval/common/label.py
@@ -164,6 +164,8 @@ def _set_pair_list(merge_similar_labels: bool) -> List[Tuple[AutowareLabel, str]
                 (AutowareLabel.CAR, "truck"),
                 (AutowareLabel.CAR, "TRUCK"),
                 (AutowareLabel.CAR, "vehicle.truck"),
+                (AutowareLabel.CAR, "trailer"),
+                (AutowareLabel.CAR, "TRAILER"),
                 (AutowareLabel.CAR, "vehicle.trailer"),
                 (AutowareLabel.BICYCLE, "motorbike"),
                 (AutowareLabel.BICYCLE, "MOTORBIKE"),
@@ -178,6 +180,8 @@ def _set_pair_list(merge_similar_labels: bool) -> List[Tuple[AutowareLabel, str]
                 (AutowareLabel.TRUCK, "truck"),
                 (AutowareLabel.TRUCK, "TRUCK"),
                 (AutowareLabel.TRUCK, "vehicle.truck"),
+                (AutowareLabel.TRUCK, "trailer"),
+                (AutowareLabel.TRUCK, "TRAILER"),
                 (AutowareLabel.TRUCK, "vehicle.trailer"),
                 (AutowareLabel.MOTORBIKE, "motorbike"),
                 (AutowareLabel.MOTORBIKE, "MOTORBIKE"),