diff --git a/localization/localization_error_monitor/src/diagnostics.cpp b/localization/localization_error_monitor/src/diagnostics.cpp
index 0c5a4a7800639..375fccfa06787 100644
--- a/localization/localization_error_monitor/src/diagnostics.cpp
+++ b/localization/localization_error_monitor/src/diagnostics.cpp
@@ -23,7 +23,7 @@ diagnostic_msgs::msg::DiagnosticStatus checkLocalizationAccuracy(
   diagnostic_msgs::msg::DiagnosticStatus stat;
 
   diagnostic_msgs::msg::KeyValue key_value;
-  key_value.key = "localization_accuracy";
+  key_value.key = "localization_error_ellipse";
   key_value.value = std::to_string(ellipse_size);
   stat.values.push_back(key_value);
 
@@ -47,7 +47,7 @@ diagnostic_msgs::msg::DiagnosticStatus checkLocalizationAccuracyLateralDirection
   diagnostic_msgs::msg::DiagnosticStatus stat;
 
   diagnostic_msgs::msg::KeyValue key_value;
-  key_value.key = "localization_accuracy_lateral_direction";
+  key_value.key = "localization_error_ellipse_lateral_direction";
   key_value.value = std::to_string(ellipse_size);
   stat.values.push_back(key_value);
 
diff --git a/simulator/fault_injection/config/fault_injection.param.yaml b/simulator/fault_injection/config/fault_injection.param.yaml
index 1a57b852f7361..ac02442d70b4d 100644
--- a/simulator/fault_injection/config/fault_injection.param.yaml
+++ b/simulator/fault_injection/config/fault_injection.param.yaml
@@ -4,7 +4,7 @@
       vehicle_is_out_of_lane: "lane_departure"
       trajectory_deviation_is_high: "trajectory_deviation"
       localization_matching_score_is_low: "ndt_scan_matcher"
-      localization_accuracy_is_low: "localization_accuracy"
+      localization_accuracy_is_low: "localization_error_ellipse"
       map_version_is_different: "map_version"
       trajectory_is_invalid: "trajectory_point_validation"
       cpu_temperature_is_high: "CPU Temperature"
diff --git a/system/system_error_monitor/config/diagnostic_aggregator/localization.param.yaml b/system/system_error_monitor/config/diagnostic_aggregator/localization.param.yaml
index 55af6ab2d2c55..9ed82304036cc 100644
--- a/system/system_error_monitor/config/diagnostic_aggregator/localization.param.yaml
+++ b/system/system_error_monitor/config/diagnostic_aggregator/localization.param.yaml
@@ -24,9 +24,9 @@
               contains: ["ndt_scan_matcher"]
               timeout: 1.0
 
-            localization_accuracy:
+            localization_error_ellipse:
               type: diagnostic_aggregator/GenericAnalyzer
-              path: localization_accuracy
+              path: localization_error_ellipse
               contains: ["localization: localization_error_monitor"]
               timeout: 1.0
 
diff --git a/system/system_error_monitor/config/system_error_monitor.param.yaml b/system/system_error_monitor/config/system_error_monitor.param.yaml
index 1778f6594f0c3..2b58f5b42c0be 100644
--- a/system/system_error_monitor/config/system_error_monitor.param.yaml
+++ b/system/system_error_monitor/config/system_error_monitor.param.yaml
@@ -24,7 +24,7 @@
 
         /autoware/localization/node_alive_monitoring: default
         /autoware/localization/performance_monitoring/matching_score: { sf_at: "warn", lf_at: "none", spf_at: "none" }
-        /autoware/localization/performance_monitoring/localization_accuracy: default
+        /autoware/localization/performance_monitoring/localization_error_ellipse: default
 
         /autoware/map/node_alive_monitoring: default
 
diff --git a/system/system_error_monitor/config/system_error_monitor.planning_simulation.param.yaml b/system/system_error_monitor/config/system_error_monitor.planning_simulation.param.yaml
index 9784259490ec2..f1031444394d0 100644
--- a/system/system_error_monitor/config/system_error_monitor.planning_simulation.param.yaml
+++ b/system/system_error_monitor/config/system_error_monitor.planning_simulation.param.yaml
@@ -24,7 +24,7 @@
 
         /autoware/localization/node_alive_monitoring: default
         # /autoware/localization/performance_monitoring/matching_score: { sf_at: "warn", lf_at: "none", spf_at: "none" }
-        # /autoware/localization/performance_monitoring/localization_accuracy: default
+        # /autoware/localization/performance_monitoring/localization_error_ellipse: default
 
         /autoware/map/node_alive_monitoring: default