Patent ID: 8678115

Claim:
A vehicle drive device, comprising: a case with a support wall; a rotating electrical machine that is accommodated in the case, the rotating electrical machine having a rotor and a stator; a rotor support member that rotatably supports the rotor placed radially inside the stator; a bearing that is placed between the support wall and the rotor support member; a lubricant supply portion that supplies a lubricant to the bearing from radially inside; a rotation sensor having a sensor stator that is fixed to the support wall radially outside the bearing, and a sensor rotor that is placed radially outside the sensor stator and is fixed to a sensor rotor attachment portion formed so as to protrude from a side face of the rotor support member on an axial first direction side, which is one side in an axial direction of the rotating electrical machine; and a communication passage that is provided in the rotor support member radially outside of the sensor rotor, and communicates a first space, which extends radially outward from the axial first direction side of the sensor rotor and is formed between the support wall and the rotor support member, with a second space, which is formed between the sensor rotor and the rotor support member, wherein the support wall extends at least in a radial direction to the axial first direction side, after lubricating the bearing, the lubricant is discharged from the second space to the first space through the communication passage, the rotor support member has a cylindrical inner support portion that supports the rotor from radially inside, an axial groove portion is formed which extends in the axial direction along a joint surface between an inner peripheral surface of the rotor and an outer peripheral surface of the inner support portion, and opens to a side face of the rotor on the axial first direction side, and the communication passage is formed so as to extend inside the rotor support member at least in the radial direction to communicate with the axial groove portion and so as to open to the first space in the side face of the rotor on the axial first direction side via the axial groove portion.