[Object]Provided is an electric power control device that allows a work vehicle to travel while carrying out a utility work smoothly.[Solution]An electric power control device 9 includes an operational state information acquisition section 31 for acquiring operational state information indicative of an operational state of a work vehicle, a battery information acquisition section 32 for acquiring battery information indicative of a state of a battery which is mounted on the work vehicle, a storage section 33 for storing in advance operational mode information specifying possible operational modes of the work vehicle, a travel unit that causes the work vehicle to travel based on the operational state information, the battery information and the operational mode information, a distributed electric power calculation section 34 for calculating distributed electric powers of electric power outputted from the battery to be distributed to the travel unit and an implement unit that effects the utility work respectively, and an instruction section 35 for instructing the distributed electric powers to a travel control section that controls the travel unit and an implement control section that controls the implement unit, respectively.
