In a drive apparatus having an integrated structure where a rotating electric machine and an inverter and a voltage converter for driving the rotating electric machine are integrally stored in a case, lubricant oil carried up by the rotation of the motor-generator flows into a storage chamber for a reactor from an opening. The lubricant oil flown from the opening is stored inside the storage chamber with the use of a dividing wall provided between a portion where the motor-generator is stored and the storage chamber, whereby at least part of reactor is immersed in the lubricant oil. Thus, the performance of cooling the reactor is ensured.