Cooling device for vehicle rotating machine

The invention provides a cooling device for a vehicle rotating machine. The cooling device for the vehicle rotating machine can restrain the volume of the vehicle rotating machine in the vehicle rotating machine and ensure insulation strength at the same time. The driving of the electric oil pump (EOP) is controlled on the basis of the pressure difference ([delta] P) between the atmospheric pressure (Pair) and the pressure reference value (P0), so that the driving of the electric oil pump (EOP) can be appropriately controlled on the basis of the pressure difference ([delta] P). Therefore, even if the atmospheric pressure (Pair) changes, the stator coils (48, 55) can be adjusted to the coil temperature (Tcoil) corresponding to the atmospheric pressure (Pair) by driving the electric oil pump (EOP) in accordance with the electric oil pump (EOP), thereby ensuring the insulation strength (Vins) of the stator coils (48, 55). As a result, the insulation strength (Vins) of the stator coils (48, 55) can be ensured whi