Transmission device

A transmission device, comprising:

• a sun gear;
• a ring gear arranged concentrically with the sun gear;
• planetary gears meshing with the sun gear and with the ring gear;
• bearings through each of which a shaft of a corresponding one of the planetary gears is inserted;
• a differential case including bearing holders each holding a corresponding one of the bearings;
• a differential mechanism arranged inside the differential case;
• a first output shaft and a second output shaft that are coupled to the differential mechanism;
• and
• a gear case supporting the differential case in a rotatable manner, wherein the bearing holders each include:
• a cylindrical part holding a corresponding one of the bearings, and
• a pocket that is recessed from a radially inner side toward a radially outer side of the sun gear to have an internal space and that overlaps with the corresponding one of the bearings in an axial direction of the sun gear, and
• the gear case includes a protrusion that is arranged to overlap with the pocket of each bearing holder from the radially inner side of the sun gear and that protrudes toward the bearings in the axial direction of the sun gear.