To provide an automatic image adjustment device that can automatically detect the display positions, display state, and the like of a test pattern displayed on a screen, the imaging angles of the mirror to image an adjustment pattern displayed at the positions corresponding to the vertices of a relatively small rectangle on a screen are first detected. According to the detected imaging angles, the CPU calculates the imaging angles for imaging the adjustment points at the four corners of the screen. Then, on the basis of the imaging angles for the adjustment points at the four corners, the imaging angles for the remaining adjustment points are calculated. Afterwards, the test pattern, such as the one used for convergence adjustment, can be displayed successively at the adjustment points, and the test pattern at each of the adjustment pattern can be imaged by the camera with the mirror being automatically set at the corresponding imaging angle. Thus, information on the display position, display states and the like of the test pattern can be automatically obtained and analyzed.