Patent ID: 7868500

Claim:
A stepping motor comprising: a housing includes a first wall and a second wall facing each other; a supporting shaft held by the first wall and the second wall; a rotor having a through hole into which the supporting shaft is inserted to rotatably hold the rotor, wherein the rotor has a first end face and a second end face in an axial direction of the rotor, the first end face and the first wall have a first clearance therebetween, and the second end face and the second wall have a second clearance therebetween; a stator arranged to surround the rotor and including a magnetic yoke and a coil; a lubricant filling between the through hole and the supporting shaft; and an oil repellent agent applied at a predetermined first area of the first end face around the through hole and a predetermined second area of the second end face around the through hole, wherein: the rotor further includes a magnet having a ring shape and coaxially arranged with the through hole; and the first clearance and the second clearance are provided by a magnetic force due to a magnetic flux flowing between the magnet and the magnetic yoke.