To provide a oneway clutch not causing wear of mechanical parts during not transmitting torque.

A oneway clutch has a cylindrical first rotating body 2 and a cylindrical second rotating body 3 arranged coaxially and relatively rotatable and a torque transmitting part 4 transmitting torque between the first rotating body 2 and the second rotating body 3. The first rotating body 2 has a magnet row 22 constituted by evenly arranging a plurality of magnet pairs magnetized obliquely relative to a rotation axis in a peripheral face. The torque transmitting part 4 has a cylindrical third rotating body 42 arranged coaxially between the first rotation body 2 and the second rotating body 3 and capable of relatively rotating and moving in the rotating axis direction to the first rotating body 2, a magnet row 44 constituted by evenly arranging a plurality of magnet pairs obliquely magnetized in substantially the same direction as the magnet row 22 in the peripheral face of the third rotating body 42, and an abutting part 43 abutting on or moving away from the second rotating body 3 in the case the third rotating body 42 moves in the rotating axis direction according to the difference of rotational speeds of the respective magnet rows 22, 42.