PURPOSE: To offer such a hinge pin that is ease of detachment and unencumbered for coating in the preprocess of fitting process for a car body, for example, a coating process or welding process.

CONSTITUTION: Two clip fitting recess grooves are formed at a tip part of a hinge pin 8, while a ring tacking clip 15 consisting of an elastic material is fitted in the recess groove on one side, and a regular slip preventing clip 16 is fitted in the recess groove on the other, respectively. Here, an outer diameter of the tacking clip 15 is slightly larger than each diameter of insertional holes 5a, 7a, and thereby the hinge pin 8 is made so as not to be slipped off by vibration or the like, and simultaneously it is made so as to be slipped off when a certain degree of force is exerted itself so positively.