The present invention can make the motor life of a motor be longer under the high temperature environment. The motor has a sleeve which is formed by a porous material made of a metal powder and the sleeve is held in a cylindrical sleeve holding part. An annular concave gap is formed between the sleeve and the sleeve holding part. In this annular concave gap, a member which can keep an excess oil is inserted. A first upper inner peripheral part of the sleeve holding part has a first minute gap between an outer peripheral surface of the sleeve, and the first minute gap has an enough width for an adhering oil to be absorbed by the sleeve when the adhering oil adheres to the first minute gap.