diff --git a/common/tier4_state_rviz_plugin/src/custom_button.cpp b/common/tier4_state_rviz_plugin/src/custom_button.cpp
index 0ef2628577135..26d9d699038d8 100644
--- a/common/tier4_state_rviz_plugin/src/custom_button.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_button.cpp
@@ -53,11 +53,13 @@ QSize CustomElevatedButton::sizeHint() const
   return QSize(width, height);
 }
 
+// cppcheck-suppress unusedFunction
 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 & disabledBgColor, const QColor & disabledTextColor)
@@ -71,6 +73,7 @@ void CustomElevatedButton::updateStyle(
   update();  // Force repaint
 }
 
+// cppcheck-suppress unusedFunction
 void CustomElevatedButton::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
diff --git a/common/tier4_state_rviz_plugin/src/custom_container.cpp b/common/tier4_state_rviz_plugin/src/custom_container.cpp
index 0b0aa1ccd6ed5..c82ca685ca9ba 100644
--- a/common/tier4_state_rviz_plugin/src/custom_container.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_container.cpp
@@ -26,17 +26,7 @@ CustomContainer::CustomContainer(QWidget * parent) : QFrame(parent), cornerRadiu
   setLayout(layout);
 }
 
-void CustomContainer::setCornerRadius(int radius)
-{
-  cornerRadius = radius;
-  update();
-}
-
-int CustomContainer::getCornerRadius() const
-{
-  return cornerRadius;
-}
-
+// cppcheck-suppress unusedFunction
 QGridLayout * CustomContainer::getLayout() const
 {
   return layout;  // Provide access to the layout
@@ -50,6 +40,7 @@ QSize CustomContainer::sizeHint() const
   return QSize(width, height);
 }
 
+// cppcheck-suppress unusedFunction
 QSize CustomContainer::minimumSizeHint() const
 {
   return sizeHint();
diff --git a/common/tier4_state_rviz_plugin/src/custom_icon_label.cpp b/common/tier4_state_rviz_plugin/src/custom_icon_label.cpp
index 6e4d32d40f7fb..28458d7c79d71 100644
--- a/common/tier4_state_rviz_plugin/src/custom_icon_label.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_icon_label.cpp
@@ -50,11 +50,13 @@ QSize CustomIconLabel::sizeHint() const
   return QSize(size, size);
 }
 
+// cppcheck-suppress unusedFunction
 QSize CustomIconLabel::minimumSizeHint() const
 {
   return sizeHint();
 }
 
+// cppcheck-suppress unusedFunction
 void CustomIconLabel::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
diff --git a/common/tier4_state_rviz_plugin/src/custom_label.cpp b/common/tier4_state_rviz_plugin/src/custom_label.cpp
index 1f96fc0d45095..59df84138b890 100644
--- a/common/tier4_state_rviz_plugin/src/custom_label.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_label.cpp
@@ -46,11 +46,13 @@ QSize CustomLabel::sizeHint() const
   return QSize(width, height);
 }
 
+// cppcheck-suppress unusedFunction
 QSize CustomLabel::minimumSizeHint() const
 {
   return sizeHint();
 }
 
+// cppcheck-suppress unusedFunction
 void CustomLabel::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
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 8063bdc0fbc28..3f93df006415e 100644
--- a/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_segmented_button.cpp
@@ -40,6 +40,7 @@ CustomSegmentedButtonItem * CustomSegmentedButton::addButton(const QString & tex
   return button;
 }
 
+// cppcheck-suppress unusedFunction
 QButtonGroup * CustomSegmentedButton::getButtonGroup() const
 {
   return buttonGroup;
@@ -54,11 +55,13 @@ QSize CustomSegmentedButton::sizeHint() const
   //   layout->itemAt(0)->widget()->height() + 10);
 }
 
+// cppcheck-suppress unusedFunction
 QSize CustomSegmentedButton::minimumSizeHint() const
 {
   return sizeHint();
 }
 
+// cppcheck-suppress unusedFunction
 void CustomSegmentedButton::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
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 f2d15260c4e41..3c671c988f936 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
@@ -32,17 +32,6 @@ CustomSegmentedButtonItem::CustomSegmentedButtonItem(const QString & text, QWidg
   setCursor(Qt::PointingHandCursor);
 }
 
-void CustomSegmentedButtonItem::setColors(
-  const QColor & bg, const QColor & checkedBg, const QColor & activeText,
-  const QColor & inactiveText)
-{
-  bgColor = bg;
-  checkedBgColor = checkedBg;
-  activeTextColor = activeText;
-  inactiveTextColor = inactiveText;
-  update();
-}
-
 // void CustomSegmentedButtonItem::updateSize()
 // {
 //   QFontMetrics fm(font());
@@ -51,12 +40,14 @@ void CustomSegmentedButtonItem::setColors(
 //   setFixedSize(width, height);
 // }
 
+// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setHovered(bool hovered)
 {
   isHovered = hovered;
   updateCheckableState();
 }
 
+// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::setCheckableButton(bool checkable)
 {
   setCheckable(checkable);
@@ -71,18 +62,21 @@ 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;
   update();
 }
 
+// cppcheck-suppress unusedFunction
 void CustomSegmentedButtonItem::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
diff --git a/common/tier4_state_rviz_plugin/src/custom_slider.cpp b/common/tier4_state_rviz_plugin/src/custom_slider.cpp
index cf3f7c3d4638f..16dfda19a87bf 100644
--- a/common/tier4_state_rviz_plugin/src/custom_slider.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_slider.cpp
@@ -19,6 +19,7 @@ CustomSlider::CustomSlider(Qt::Orientation orientation, QWidget * parent)
   setMinimumHeight(40);  // Ensure there's enough space for the custom track
 }
 
+// cppcheck-suppress unusedFunction
 void CustomSlider::paintEvent(QPaintEvent *)
 {
   QPainter painter(this);
diff --git a/common/tier4_state_rviz_plugin/src/custom_toggle_switch.cpp b/common/tier4_state_rviz_plugin/src/custom_toggle_switch.cpp
index 3b58ded626439..b171fa554cd01 100644
--- a/common/tier4_state_rviz_plugin/src/custom_toggle_switch.cpp
+++ b/common/tier4_state_rviz_plugin/src/custom_toggle_switch.cpp
@@ -30,6 +30,7 @@ QSize CustomToggleSwitch::sizeHint() const
   return QSize(50, 30);  // Preferred size of the toggle switch
 }
 
+// cppcheck-suppress unusedFunction
 void CustomToggleSwitch::paintEvent(QPaintEvent *)
 {
   QPainter p(this);
diff --git a/common/tier4_state_rviz_plugin/src/include/custom_container.hpp b/common/tier4_state_rviz_plugin/src/include/custom_container.hpp
index 5142b409ebc88..ef81ef2417d52 100644
--- a/common/tier4_state_rviz_plugin/src/include/custom_container.hpp
+++ b/common/tier4_state_rviz_plugin/src/include/custom_container.hpp
@@ -31,12 +31,10 @@ class CustomContainer : public QFrame
   // Methods to set dimensions and corner radius
   void setContainerHeight(int height);
   void setContainerWidth(int width);
-  void setCornerRadius(int radius);
 
   // Getters
   int getContainerHeight() const;
   int getContainerWidth() const;
-  int getCornerRadius() const;
   QGridLayout * getLayout() const;  // Add a method to access the layout
 
 protected:
diff --git a/common/tier4_state_rviz_plugin/src/include/custom_segmented_button_item.hpp b/common/tier4_state_rviz_plugin/src/include/custom_segmented_button_item.hpp
index 33eb9fe16aa31..ee6f48e285975 100644
--- a/common/tier4_state_rviz_plugin/src/include/custom_segmented_button_item.hpp
+++ b/common/tier4_state_rviz_plugin/src/include/custom_segmented_button_item.hpp
@@ -30,9 +30,6 @@ class CustomSegmentedButtonItem : public QPushButton
 public:
   explicit CustomSegmentedButtonItem(const QString & text, QWidget * parent = nullptr);
 
-  void setColors(
-    const QColor & bg, const QColor & checkedBg, const QColor & activeText,
-    const QColor & inactiveText);
   void setActivated(bool activated);
   void setCheckableButton(bool checkable);
   void setDisabledButton(bool disabled);