The present invention provides a power unit for conveyance, having a main power source and a standby power source. The power unit has a thermal battery provided as the standby power source. The conveyance is provided with an electronic control system and the power unit for conveyance of the present invention, and electric power for operating the electronic control system is supplied to the electronic control system from the power unit for conveyances. By employing such a thermal battery as the standby power source, the standby power source does not require to be charged, thereby ensuring a long-term reliability of the standby power source.

 
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