An internal speed changing hub is provided with a hub shaft 21 that is affixed to a frame, a drive part 22, a driven part 23, a planetary gear mechanism 24, a first one-way clutch 25, a second one-way clutch 26, a clutch control mechanism 27, first and second bearings 28, 29, third and fourth bearings 30, 31. The drive part is a tubular shape that can be connected to an input part. The driven part can be connected to an output part. The drive transmission mechanism has a planetary gear mechanism, and transmits rotation from the drive part to the driven part. The first one-way clutch transmits rotation from the carrier in one direction to the driven part. The second one-way clutch can engage and disengage the drive part and the driven part. The first and second bearings are provided with first and second bearing cones 28b, 29b installed at intervals in the axial direction of the hub shaft; first and second bearing cups 28a, 29a disposed so they can oppose the positions of the first and second bearing cones of the driven part, respectively; and first and second ball bearings 28c, 29c installed so that both of these can make contact. The third and fourth bearings are installed so that the drive part can rotate freely relative to the hub shaft.