To provide a remote drive type optical microscope device for photographing the metallic structure and the defects of an inner surface of small diameter piping which a person cannot access and for enabling immediate observation.

The optical microscope device consists of an optical microscope 1 to observe the inner surface of the piping 27, a solid-state image pick-up device 2 which converts a video reflected to the optical microscope 1 into an electrical signal, a focus adjustment mechanism 4 to adjust the focus of the optical microscope 1, a pole 5 in the tip part of which the instrument 1, 2 and 4 are installed, an alignment mechanism 8 to set the axial center of the pole 5 in parallel with the inner surface of the piping 27, a drive unit 25 attached to the end of the piping 17 so as to drive the pole 5 in the axial direction of the piping 17 and rotate the pole 5 around the axis of the pole 5, a scanning control device 15 to remotely control the drive unit 25 or the focus adjustment mechanism 4, and a TV monitor 12 to receive the electrical signal from the solid-state image pick-up device 2 and to display the video.