diff --git a/Dev/Cpp/Effekseer/Effekseer/Effekseer.Instance.cpp b/Dev/Cpp/Effekseer/Effekseer/Effekseer.Instance.cpp
index 983f8d7c03..752695b5dd 100644
--- a/Dev/Cpp/Effekseer/Effekseer/Effekseer.Instance.cpp
+++ b/Dev/Cpp/Effekseer/Effekseer/Effekseer.Instance.cpp
@@ -775,7 +775,14 @@ void Instance::UpdateTransform(float deltaFrame)
 			SIMD::Vec3f vel = SIMD::Vec3f::Transform(prevLocalVelocity_, r) + (velocity_modify_global_ + acc_global_sum);
 
 			InstanceGlobal* instanceGlobal = m_pContainer->GetRootInstance();
-			const auto result = CollisionsFunctions::Update(collisionState_, m_pEffectNode->Collisions, pos, prevGlobalPosition_, vel, instanceGlobal->EffectGlobalMatrix.GetTranslation());
+			const auto result = CollisionsFunctions::Update(
+				collisionState_,
+				m_pEffectNode->Collisions,
+				pos,
+				prevGlobalPosition_,
+				vel,
+				instanceGlobal->EffectGlobalMatrix.GetTranslation(),
+				m_pEffectNode->GetEffect()->GetMaginification());
 			location_modify_global_ -= std::get<1>(result);
 			acc_global_sum += std::get<0>(result);
 		}
diff --git a/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.cpp b/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.cpp
index 0c6677a4ed..2f7396676a 100644
--- a/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.cpp
+++ b/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.cpp
@@ -31,7 +31,8 @@ std::tuple<SIMD::Vec3f, SIMD::Vec3f> CollisionsFunctions::Update(
 	const SIMD::Vec3f& next_position_global,
 	const SIMD::Vec3f& position_global,
 	const SIMD::Vec3f& velocity_global,
-	const SIMD::Vec3f& position_center_local)
+	const SIMD::Vec3f& position_center_local,
+	float magnification)
 {
 	if (!parameter.IsEnabled)
 	{
@@ -48,10 +49,12 @@ std::tuple<SIMD::Vec3f, SIMD::Vec3f> CollisionsFunctions::Update(
 		current_position -= position_center_local;
 	}
 
-	if (next_position.GetY() < parameter.Height && current_position.GetY() >= parameter.Height)
+	const auto height = parameter.Height * magnification;
+
+	if (next_position.GetY() < height && current_position.GetY() >= height)
 	{
 		auto diff = next_position - current_position;
-		auto pos_diff = diff * (current_position.GetY() - parameter.Height) / diff.GetY();
+		auto pos_diff = diff * (current_position.GetY() - height) / diff.GetY();
 		return {SIMD::Vec3f(0, -velocity_global.GetY() * (1.0f + parameter.Bounce), 0), pos_diff};
 	}
 	else
diff --git a/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.h b/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.h
index f40a51af36..cb2f12448b 100644
--- a/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.h
+++ b/Dev/Cpp/Effekseer/Effekseer/Parameter/Collisions.h
@@ -33,7 +33,8 @@ struct CollisionsFunctions
 		const SIMD::Vec3f& next_position_global,
 		const SIMD::Vec3f& position_global,
 		const SIMD::Vec3f& velocity_global,
-		const SIMD::Vec3f& position_center_local);
+		const SIMD::Vec3f& position_center_local,
+		float magnificationScale);
 };
 
 } // namespace Effekseer