Electric working vehicle

A travel motor (8) configured from an electric motor for driving rear wheels (7) is provided in the body (2) of a dump truck (1). The travel motor (8) is connected to a main power generator (12) via a bidirectional converter (20) and the like and driven by supply of power from the main power generator (12). A resistor (21) which consumes regenerated power from the travel motor (8) is connected to the bidirectional converter (20). Cooling air from an air blower (24) is supplied to the resistor (21). The operations of a switch (23) for the resistor (21) and the air blower (24) are controlled by a controller (28). A mode selection switch (29) for selecting a heat generation mode (A), an air blowing mode (B), or a heat generation / air blowing mode (C) is connected to the controller (28).