A travel route selection system for an electric truck includes a map information acquisition unit that acquires map information including transport route information on transport routes. An electric power consumption map storage unit is adapted to pre-store a stop-time electric power consumption map used to estimate electric power consumption during the stoppage time during which the electric truck stops for a predetermined period with high-voltage equipment kept in operating state. A stoppage time estimation unit estimates stoppage time on each transportation route. An electric power consumption estimation unit estimates the electric power consumption on each of the transportation routes based on the stoppage time estimated by the stoppage time estimation unit as well as on the stop-time electric power consumption map. An optimal route selection unit selects an optimal route based on fundamental information including information on the amount of electric power consumption of each of the transport routes.