To provide a dental mirror not requiring frequent replacement of a light source and a battery and hardly causing fogging in insertion into the mouth as a cordless dental mirror provided with the light source.

A dental mirror is constructed of a mirror body 100 and a holder 200. The mirror body 100 is provided with a grip part 110 and a mirror plate part 120 molded of a synthetic resin integrally, and in the mirror plate part 120, a light reflection film is formed so as to serve as a mirror 130. The holder 200 houses the battery and the LED light source turned on/off via a rotational switch 230. An LED light beam 310 is radiated to the mirror 130 in the mirror main body 100 through a light guide hole 221. An insertion hole for inserting a supporting shaft of the holder 200 is formed in the grip part 110 of the mirror body 100. The mirror body 100 is installed to the holder 200 removably when the supporting shaft is inserted into the insertion hole.