diff --git a/common/tier4_state_rviz_plugin/src/custom_button.cpp b/common/tier4_state_rviz_plugin/src/custom_button.cpp
index 1a887497a2903..a2d4b92e17621 100644
--- a/common/tier4_state_rviz_plugin/src/custom_button.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_button.cpp
@@ -63,7 +63,6 @@ QSize CustomElevatedButton::minimumSizeHint() const
   return sizeHint();
 }
 
-// cppcheck-suppress unusedFunction
 void CustomElevatedButton::updateStyle(
   const QString & text, const QColor & bgColor, const QColor & textColor, const QColor & hoverColor,
   const QColor & pressedColor, const QColor & checkedColor, const QColor & disabledBgColor,
diff --git a/common/tier4_state_rviz_plugin/src/custom_container.cpp b/common/tier4_state_rviz_plugin/src/custom_container.cpp
index 4e7bafd044897..681cebbefd492 100644
--- a/common/tier4_state_rviz_plugin/src/custom_container.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_container.cpp
@@ -26,7 +26,6 @@ CustomContainer::CustomContainer(QWidget * parent) : QFrame(parent), cornerRadiu
   setLayout(layout);
 }
 
-// cppcheck-suppress unusedFunction
 QGridLayout * CustomContainer::getLayout() const
 {
   return layout;  // Provide access to the layout
diff --git a/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp b/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp
index 786b58ecf1d2e..8063bdc0fbc28 100644
--- a/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp
@@ -40,7 +40,6 @@ CustomSegmentedButtonItem * CustomSegmentedButton::addButton(const QString & tex
   return button;
 }
 
-// cppcheck-suppress unusedFunction
 QButtonGroup * CustomSegmentedButton::getButtonGroup() const
 {
   return buttonGroup;
diff --git a/common/tier4_state_rviz_plugin/src/custom_segmented_button_item.cpp b/common/tier4_state_rviz_plugin/src/custom_segmented_button_item.cpp
index d0ede8ec1dfe6..cdd3aa0d25263 100644
--- a/common/tier4_state_rviz_plugin/src/custom_segmented_button_item.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_segmented_button_item.cpp
@@ -44,14 +44,12 @@ CustomSegmentedButtonItem::CustomSegmentedButtonItem(const QString & text, QWidg
 //   setFixedSize(width, height);
 // }
 
-// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setHovered(bool hovered)
 {
   isHovered = hovered;
   updateCheckableState();
 }
 
-// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setCheckableButton(bool checkable)
 {
   setCheckable(checkable);
@@ -66,14 +64,12 @@ void CustomSegmentedButtonItem::updateCheckableState()
   update();
 }
 
-// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setDisabledButton(bool disabled)
 {
   isDisabled = disabled;
   updateCheckableState();
 }
 
-// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setActivated(bool activated)
 {
   isActivated = activated;