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diff --git a/runtime/neurun/core/include/ir/operation/LSTM.h b/runtime/neurun/core/include/ir/operation/LSTM.h
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+++ b/runtime/neurun/core/include/ir/operation/LSTM.h
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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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.
+ */
+#ifndef __NEURUN_IR_OPERATION_LSTM_H__
+#define __NEURUN_IR_OPERATION_LSTM_H__
+
+#include "ir/InternalType.h"
+#include "ir/Operation.h"
+
+namespace neurun
+{
+namespace ir
+{
+namespace operation
+{
+
+class LSTM : public Operation
+{
+public:
+  enum Input
+  {
+    INPUT = 0,
+    INPUT_TO_INPUT_WEIGHTS = 1,
+    INPUT_TO_FORGET_WEIGHTS = 2,
+    INPUT_TO_CELL_WEIGHTS = 3,
+    INPUT_TO_OUTPUT_WEIGHTS = 4,
+    RECURRENT_TO_INPUT_WEIGHTS = 5,
+    RECURRENT_TO_FORGET_WEIGHTS = 6,
+    RECURRENT_TO_CELL_WEIGHTS = 7,
+    RECURRENT_TO_OUTPUT_WEIGHTS = 8,
+    CELL_TO_INPUT_WEIGHTS = 9,
+    CELL_TO_FORGET_WEIGHTS = 10,
+    CELL_TO_OUTPUT_WEIGHTS = 11,
+    INPUT_GATE_BIAS = 12,
+    FORGET_GATE_BIAS = 13,
+    CELL_BIAS = 14,
+    OUTPUT_GATE_BIAS = 15,
+    PROJECTION_WEIGHTS = 16,
+    PROJECTION_BIAS = 17,
+    OUTPUT_STATE_IN = 18,
+    CELL_STATE_IN = 19,
+  };
+
+  enum Output
+  {
+    SCRATCH_BUFFER = 0,
+    OUTPUT_STATE_OUT = 1,
+    CELL_STATE_OUT = 2,
+    OUTPUT = 3
+  };
+
+  struct Param
+  {
+    Activation activation;
+    float cell_threshold;
+    float projection_threshold;
+  };
+
+public:
+  LSTM(const OperandIndexSequence &inputs, const OperandIndexSequence &outputs, const Param &param);
+
+public:
+  void accept(OperationVisitor &v) const override;
+  OpCode opcode() const final { return OpCode::LSTM; }
+
+public:
+  const Param &param() const { return _param; }
+
+private:
+  Param _param;
+};
+
+} // namespace operation
+} // namespace ir
+} // namespace neurun
+
+#endif // __NEURUN_IR_OPERATION_LSTM_H__