A pitch cone angle measurement method includes bringing an abutment portion into abutment against ridges, and bringing another abutment portion into abutment against the ridges at a position separated in a direction orthogonal to a rotation axis direction of the rotation power transmitting element by a radial distance from a position at which the ridges and the abutment portion are brought into abutment against each other. The method also includes measuring a distance in the rotation axis direction between the position at which the abutment portion is brought into abutment against the ridges and a position at which the other abutment portion is brought into abutment against the ridges, and calculating a pitch cone angle of the rotation power transmitting element based on the distance in the rotation axis direction and the predetermined radial distance.
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