diff --git a/localization_launch/config/localization_error_monitor.param.yaml b/localization_launch/config/localization_error_monitor.param.yaml
new file mode 100644
index 0000000000..026daf0532
--- /dev/null
+++ b/localization_launch/config/localization_error_monitor.param.yaml
@@ -0,0 +1,7 @@
+/**:
+  ros__parameters:
+    scale: 3.0
+    error_ellipse_size: 1.0
+    warn_ellipse_size: 0.8
+    error_ellipse_size_lateral_direction: 0.3
+    warn_ellipse_size_lateral_direction: 0.2
diff --git a/localization_launch/launch/localization_error_monitor/localization_error_monitor.launch.xml b/localization_launch/launch/localization_error_monitor/localization_error_monitor.launch.xml
index d2ea9ced7b..ee6047281d 100644
--- a/localization_launch/launch/localization_error_monitor/localization_error_monitor.launch.xml
+++ b/localization_launch/launch/localization_error_monitor/localization_error_monitor.launch.xml
@@ -2,10 +2,6 @@
 <launch>
     <include file="$(find-pkg-share localization_error_monitor)/launch/localization_error_monitor.launch.xml">
       <arg name="input/pose_with_cov" value="/localization/pose_with_covariance" />
-      <arg name="scale" value="3.0" />
-      <arg name="error_ellipse_size" value="1.0" />
-      <arg name="warn_ellipse_size" value="0.8" />
-      <arg name="error_ellipse_size_lateral_direction" value="1.0" />
-      <arg name="warn_ellipse_size_lateral_direction" value="0.8" />
+      <arg name="param_file" value="$(find-pkg-share localization_launch)/config/localization_error_monitor.param.yaml"/>
     </include>
 </launch>