A device for starting an internal combustion engine, comprising: a compressor configured to supply combustion gas to the internal combustion engine; an electric motor configured to drive the compressor; a power storage unit configured to supply power to the electric motor; a first power conversion unit which is connected to the power storage unit and the electric motor; a second power conversion unit which is connected to the power storage unit; wherein the power storage unit is located between the first power conversion unit and the second power conversion; an inboard power system which is connected to the second power conversion unit; an internal combustion engine rotation starter device configured to supply operation gas from an operation gas supply source without supplying any fuel to the internal combustion engine to drive the internal combustion engine; a fuel supply device configured to supply fuel to the internal combustion engine; and a control device configured to control driving the electric motor, the internal combustion engine rotation starter device, and the fuel supply device, wherein the control device is further configured to make the power storage unit store power from the inboard power system by the second power conversion unit such that a voltage of the power storage unit reaches a standby voltage set in advance when a motoring start preparation signal is input, the control device is further configured to make the storage unit supply power to the electric motor by the first power conversion unit to drive the compressor by the electric motor when the voltage of the power storage unit reaches the standby voltage, and when the rotational speed of the compressor reaches an internal combustion engine rotation-activation-starting rotational speed set in advance driven by the electric motor, and internal combustion engine rotation activation start signal is input, the control device is further configured to drive the internal combustion engine rotation starter device such that the internal combustion engine rotation starter device supplies the operation gas to the internal combustion engine to cause the internal combustion engine air running thereby raising the rotational speed of the internal combustion engine, and when the rotational speed of the internal combustion engine reaches a fuel-supply-starting rotational speed set in advance by the air running, the control device is further configured to start driving the fuel supply device such that the fuel supply device supplies fuel to the internal combustion engine to start the running of the internal combustion engine due to combustion. a compressor configured to supply combustion gas to the internal combustion engine; an electric motor configured to drive the compressor; a power storage unit configured to supply power to the electric motor; a first power conversion unit which is connected to the power storage unit and the electric motor; a second power conversion unit which is connected to the power storage unit; wherein the power storage unit is located between the first power conversion unit and the second power conversion; an inboard power system which is connected to the second power conversion unit; an internal combustion engine rotation starter device configured to supply operation gas from an operation gas supply source without supplying any fuel to the internal combustion engine to drive the internal combustion engine; a fuel supply device configured to supply fuel to the internal combustion engine; and a control device configured to control driving the electric motor, the internal combustion engine rotation starter device, and the fuel supply device, wherein the control device is further configured to make the power storage unit store power from the inboard power system by the second power conversion unit such that a voltage of the power storage unit reaches a standby voltage set in advance when a motoring start preparation signal is input, the control device is further configured to make the storage unit supply power to the electric motor by the first power conversion unit to drive the compressor by the electric motor when the voltage of the power storage unit reaches the standby voltage, and when the rotational speed of the compressor reaches an internal combustion engine rotation-activation-starting rotational speed set in advance driven by the electric motor, and internal combustion engine rotation activation start signal is input, the control device is further configured to drive the internal combustion engine rotation starter device such that the internal combustion engine rotation starter device supplies the operation gas to the internal combustion engine to cause the internal combustion engine air running thereby raising the rotational speed of the internal combustion engine, and when the rotational speed of the internal combustion engine reaches a fuel-supply-starting rotational speed set in advance by the air running, the control device is further configured to start driving the fuel supply device such that the fuel supply device supplies fuel to the internal combustion engine to start the running of the internal combustion engine due to combustion.