A working device connected to a traveling vehicle having a prime mover and configured to perform an agricultural work, includes: a working portion to perform an agricultural work； an electric motor to be driven by electric power； a power transmission mechanism to which power generated by the electric motor is inputted, configured to transmit the power to the working portion； a regeneration resistor to consume a regenerative power generated in the electric motor； a switch portion to switch, between a connecting state and a shut-off state, a state established between the electric motor and the regeneration resistor； and a controller portion to control driving of the electric motor and switching of the switch portion.
