To provide a dental mirror device capable of recognizing the position of a video fetched to the tip of a fiber scope and the video viewed from a spectacle side eyepiece even when the direction of an examination mirror part inserted into the mouth is changed.

This dental mirror device 1 is composed of the fiber scope 10, a cylindrical operation part 20, a main body case 30, a connector 40 and a spectacle type holding part 50. In the dental mirror device 1, a projection 25 is formed on the outer peripheral surface of a cylindrical part 21 at the cylindrical operation part 20, a projection piece 35 is formed at the insertion shaft part 39 of a fixing part 31 and the projection piece 35 is freely rotatably and slidably fitted to the projection 25. Thus, even when the user of the dental mirror device 1 inserts the examination mirror part 28 into the mouth and rotates it with the center axis of the cylindrical operation part 20 as a rotation axis, the fiber scope 10 is adhered to the fixing part 31 and the fixing part 31 is kept in an immobile state by the user holding a handle part integrated with the main body case 30 and a holding projection 34. As a result, since the direction of the video imaged at the eyepiece 13 is not changed, the video of teeth inside the mouth is clearly and directly viewed.