PURPOSE: To provide an original mirror mounting structure which allows easy mounting of a mirror and is simple in construction.

CONSTITUTION: The front end of an opening 50 for arranging the mirror formed at a body 48 is projectingly provided with a retaining edge 51 and the rear surface of this opening for arranging the mirror is projectingly provided with a retaining projection by opening a spacing corresponding to the thickness of the mirror from the retaining edge. A mirror engaging part 53 consisting of a thin spring part 54 and an engaging projection 55 projectingly formed at the rear surface of this thin spring part is formed atop the opening for arranging the mirror. The lower side of the mirror is supported between the retaining edge and the retaining projection and the rear surface 55a of the engaging projection of the mirror engaging part is brought into elastic contact with the top side of the mirror.