Transmission device

A transmission device comprising a transmission unit,

• the transmission unit comprising a gear reducer and a differential device whose differential case receives an output of the gear reducer,
• the transmission unit being housed inside a transmission case with an oil storing part at a bottom part of the transmission case,
• the gear reducer comprising:
• a sun gear coupled to a power source;
• a ring gear arranged concentrically to the sun gear and fixed to the transmission case;
• two or more planetary gears meshing with the sun gear and the ring gear;
• and
• a carrier rotatably supporting the two or more planetary gears for rotating integrally with the differential case,
• an outer circumferential wall of the transmission case being provided with an oil guide including an oil capturing part and an oil guiding part, the oil capturing part being capable of capturing an oil in the oil storing part lifted by the two or more planetary gears in response to the two or more planetary gears revolving in a normal direction of the carrier while rotating in an opposite direction to the normal direction as the carrier rotates in the normal direction, and the oil guiding part for guiding the oil captured by the oil capturing part to a lubrication target part inside the transmission case, and
• as viewed in a projection plane orthogonal to a rotation axis of the transmission unit, the oil capturing part being arranged in a semicircle part of the outer circumferential wall, the semicircle part starting at a deepest part of the oil storing part and being positioned on a front side in the normal direction.