Patent ID: 8403652

Claim:
A molecular pump comprising: a cylindrical casing; a stator portion formed in the casing; a shaft disposed in the stator portion; a bearing pivotally supporting the shaft with respect to the stator portion; a rotor which is attached to the shaft and rotates integrally with the shaft; a motor for rotationally driving the shaft; a shock absorbing member; and a flange portion provided at an end portion of the casing, the flange portion having a bolt hole through which a bolt for fixing the casing and a fixed member to each other penetrates and an insertion hole which is provided adjacent to the bolt hole and in which the shock absorbing member is inserted so that at least one end side, furthest in an axial direction of the bolt, of the shock absorbing member is axially spaced apart from a head of the bolt or a member that is to be fixed by the bolt.