To provide an oil filter capable of easily turning an oil filter main body to screw-fit the oil filter when screw-fitting it in an oil filter mounting part and letting an oil seal leave securely together with the oil filter when detaching the oil filter.

A lid member mounted in an opening part of a bottomed cylindrical vessel has a locking bent claw bent annularly toward the outer periphery along an inner peripheral side of a fitting channel in which an annular seal member is fitted and a locking hole opened between a plurality of locking bent claws. The annular seal member is provided with an annular seal main body fitted into a fitting channel part in play, an inner peripheral collar part provided peripherally on an inner peripheral side of the annular seal main body, and a locking projection provided by protruding from the inner peripheral collar part by corresponding to the locking hole.

COPYRIGHT: (C)2006,JPO&NCIPI