Wheel drive means

The present invention provide a wheel driving apparatus, which does not require disassembling the entire vehicle body from the wheel driving device, it is possible to check, replace worn parts in the apparatus. A wheel driving apparatus of the present invention (100) includes: a planetary gear (24) and the internal gear (28) of the planetary gear mechanism (10); (28) integrated with the internal gear, is mounted with rollers (48) and the internal gear the rotation is transmitted to the housing (30) of the roller; and a more embedded in the body-inside of the housing (30) of the inner peripheral side of planetary gear (24) and rotary bearing (46) rotatably supported by the housing. The inner diameter of the bearing (46) of the outer ring (46B) is larger than the planet gear (24) outer diameter.