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diff --git a/src/core/expression/RBALambdaExpression.hpp b/src/core/expression/RBALambdaExpression.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.
+ */
+
+/**
+ * RBALambdaExpression class header
+ */
+
+#ifndef RBALAMBDAEXPRESSION_HPP
+#define RBALAMBDAEXPRESSION_HPP
+
+#include "RBAExpression.hpp"
+
+namespace rba
+{
+
+class RBAArbitrator;
+class RBAConstraintInfo;
+class RBAVariable;
+class RBARuleObject;
+
+class DLL_EXPORT RBALambdaExpression : public RBAExpression
+{
+public:
+  RBALambdaExpression()=default;
+  RBALambdaExpression(const RBALambdaExpression&)=delete;
+  RBALambdaExpression(const RBALambdaExpression&&)=delete;
+  RBALambdaExpression& operator=(const RBALambdaExpression&)=delete;
+  RBALambdaExpression& operator=(const RBALambdaExpression&&)=delete;
+  virtual ~RBALambdaExpression()=default;
+
+public:
+  void setX(RBAVariable* const x);
+  void setBodyText(RBAExpression* const expr);
+  RBAVariable* const getX() const;
+  RBAExpression* const getBodyText() const;
+
+  RBAModelElementType getModelElementType() const override;
+  bool executeCore(RBAConstraintInfo* info, RBAArbitrator* arb) const override;
+  const RBARuleObject* getReferenceObjectCore(RBAConstraintInfo* info,
+                                                      RBAArbitrator* arb) const override;
+  std::int32_t getValueCore(RBAConstraintInfo* info,
+                                    RBAArbitrator* arb) const override;
+
+  void setRuleObj(const RBARuleObject* const ruleObj);
+  void clearRuleObj();
+
+  // Log
+#ifdef RBA_USE_LOG
+  void createHierarchy();
+  const std::string getExpressionText() const override;
+  const std::string getCoverageExpressionText() const override;
+#endif
+
+private:
+  // "variable" is not const because it calls setExpression() 
+  // in the arbitration process.
+  RBAVariable* variable_;
+  RBAExpression* bodyText_ {nullptr};
+  const RBARuleObject* ruleObj_ {nullptr};
+};
+
+}
+
+#endif