Power transmission device

A power transmission device that comprises:

• a shift device accommodated in a case;
• and an oil pump that sucks and discharges hydraulic oil, comprising:
• a gear to which power is transmitted from the shift device;
• a gear shaft which has a breather chamber having at least one end side in an axial direction being opened, and to which the gear is attached;
• a bearing that supports the gear shaft rotatably with respect to the case on the one end side of the breather chamber;
• a vent pipe that communicates with the opening of the breather chamber and outside of the case;
• a leakage oil passage that is formed in the case, that has an outlet port opening to inside of the case, and that allows leakage oil of the oil pump to flow out from the outlet port;
• a receiving member that receives the leakage oil flowing out from the outlet port of the leakage oil passage;
• a guide passage that guides the leakage oil received by the receiving member to the bearing;
• and
• an inflow suppressing portion that suppresses entry of thrown-up oil thrown up with rotation of the gear into the receiving member.