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diff --git a/src/core/expression/RBAExpressionMaker.hpp b/src/core/expression/RBAExpressionMaker.hpp
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+/**
+ * Copyright (c) 2019 DENSO CORPORATION.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/// @file  RBAExpreessionMaker.hpp
+/// @brief Abstract class definition header file for expression object generation
+
+#ifndef RBAEXPRESSIONMAKER_HPP
+#define RBAEXPRESSIONMAKER_HPP
+
+#include <cstdint>
+#include "RBAModelElementMaker.hpp"
+
+namespace rba
+{
+
+class RBAExpression;
+
+/// @brief Abstract class for expression object gcreation
+class DLL_EXPORT RBAExpressionMaker : public RBAModelElementMaker
+{
+public:
+  explicit RBAExpressionMaker(const std::string& label="");
+  RBAExpressionMaker(const RBAExpressionMaker&)=delete;
+  RBAExpressionMaker(const RBAExpressionMaker&&)=delete;
+  RBAExpressionMaker& operator=(const RBAExpressionMaker&)=delete;
+  RBAExpressionMaker& operator=(const RBAExpressionMaker&&)=delete;
+  virtual ~RBAExpressionMaker()=default;
+
+protected:
+  /// @brief To set ”Let" expression
+  /// @details Generate Let expression from jsonElem and register it in expr.
+  ///          Return the number of variables that have been registered
+  ///          (pushed) to ModelFactory, and pop them when the reference of 
+  ///          variables is completed in function that called this function.
+  /// @return the number of pushed variables
+  std::int32_t setLetStatement(RBAModelImpl* model,
+                               RBAExpression* expr,
+                               const RBAJsonElement* jsonElem);
+
+};
+
+}
+
+#endif