An electric oil pump (ELOP) provided in parallel to a mechanical oil pump driven by an engine supplies oil to a clutch of a transmission. The ELOP is rotated in advance of a request to operate the ELOP at a targeted relatively-low first preoperation rotational speed. When an actual rotational speed matches the first preoperation rotational speed and an actual current matches a threshold, the ELOP is rotated at a targeted relatively-high second preoperation rotational speed. At least when an actual rotational speed matches a second predetermined rotational speed not higher than the second preoperation rotational speed, it is determined that preoperation is completed. If the number of restarts during the preoperation as one operation history of the ELOP reaches or exceeds the predetermined number of times, the current supply to the ELOP is interrupted to limit the restart, thereby reducing the number of repeated restarts of the ELOP.