A generator unit to be attached to a traveling vehicle that has a prime mover and a PTO shaft to transmit power from the prime mover, includes: a generator； an input shaft having: a first connector portion configured to be connected to the PTO shaft； and a second connector portion configured to be connected to a working device to be connected to the traveling vehicle； a transmitter mechanism to transmit, to the generator, power supplied from the PTO shaft, the power being inputted from the first connector portion to the input shaft； and an attachment frame having: an attachment portion to which the generator, the input shaft, and the transmitter mechanism are attached； and a mounting portion configured to be mounted to the traveling vehicle.
