Patent ID: 8127788

Claim:
A parts assembly, comprising: a housing including a first part assembly hole on which a first apparatus component is assembled, the first apparatus component being fixed to the housing by means of a caulking for forming a caulking portion by a deformation of a bearing surface of the housing on which the first apparatus component is seated, the housing including a second part assembly hole provided at a portion to which a force applied to the housing when the bearing surface is caulked and deformed is propagated and on which a second apparatus component is assembled, the housing including a sacrificial deformation portion deformed by a force applied to the housing when the bearing surface is deformed by means of the caulking, the sacrificial deformation portion attenuating a force propagated to a portion including the second part assembly hole, further comprising a groove provided at an inner periphery of the first part assembly hole, wherein the bearing surface extends in a radially inner direction of the first part assembly hole relative to the groove and the sacrificial deformation portion is constituted by a housing walled portion formed between the groove and the bearing surface.