A camera device includes a camera head that captures an observation image of a target site which is obtained by a surgical microscope, and a camera control unit that processes a signal of the observation video captured by the camera head. The camera head captures right and left observation images having a parallax from the surgical microscope to obtain a high-resolution observation video including right and left parallax videos for one screen, and the camera control unit cuts out the right parallax video and the left parallax video from the observation video including the right and left parallax videos to generate a high-resolution 3D video which is displayed on a monitor in 3D and with which stereoscopic observation can be performed.