The present invention is an endoscope device in which a portion of the optical system can be changed using an optical adaptor, provided with: an image pickup member for capturing an image that is input from an optical system that incorporates a reference scope or user scope, and an optical adaptor a first recording medium that records a first information that includes at least distortion parameters of the reference scope which indicate the optical properties of the reference scope a second recording medium that records a second information that includes at least distortion parameters of the user scope which indicate the optical properties of the user scope and a distortion correcting member that corrects distortion in the image captured by the image pickup member when the user scope and the optical adaptor are combined, based on the first information which is read out from the first recording medium and the second information which is read out from the second recording medium.
