To keep a DC voltage constant irrespective of the rotational speed of a permanent magnet synchronous generator and to obtain its output to the maximum extent in a device that takes out DC electric power from the synchronous generator.

This controller for the permanent magnet synchronous generator, which converts the output of the permanent magnet synchronous generator 1 into DC with the output of the generator 1 connected to a power converter 2, comprises a DC voltage controller 5 that detects the DC voltage Vdc of the output of the power converter and outputs a torque command by proportional-plus-integral amplifying deviation between the DC voltage and a DC voltage command, and a torque controller 6 that outputs a signal for controlling the power converter so that the torque of the generator can be controlled in accordance with the torque command of the output of the DC voltage controller.