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A feature for joining gear wheels includes a disk portion 21 and external cogs 22 provided to an input means 12, a second cylindrical guiding portion 31 provided on one side of an internal/external gear wheel 15 and coaxial with a first cylindrical guiding portion 30, an external gear wheel 18 rotatably fit in and attached to the input means 12 and having external cogs 38 having a same shape as the external cogs 22 of the input means 12 and engaging with internal cogs 33 of the gear wheel 15, and an internal gear wheel 19 having the internal cogs 40 engaging with the external cogs 22 and the external cogs 38, having an annular guiding portion 39 to be guided by the second cylindrical guiding portion 31, arranged in between the disk portion 21 and the internal/external gear wheel 15, and revolving along with the gear wheel 15.