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摘要

A belt-drive CVT (3) includes a pair of pulleys (21,22), each of which has a stationary pulley (21a,22a) and a movable pulley (21b,22b) that moves toward or away from the stationary pulley in an axial direction of the pulley, a belt (23) that is wound around the pair of pulleys and a rotation state detecting device for detecting rotation of the pulley. The rotation state detecting device has a tone wheel (25) that rotates integrally with the pulley (22) and a sensor (KS2) that faces the tone wheel. The tone wheel has a cylinder portion (25b;25b';25b") that extends along a moving direction of the movable pulley. The cylinder portion is provided with a plurality of detection portions (26;27;28) which are arranged at regular intervals in a circumferential direction throughout an entire circumference of the cylinder portion and which extend along the moving direction of the movable pulley.