A projection type video display device is provided, which is capable of displaying a plurality of kinds of input videos with different aspect ratios without requiring cumbersome adjustment operations. The device includes a light source (11), a display element (13) for displaying a display video in a display area based on a video signal and modulating illumination light (12) from the light source based on the video signal to form an optical image (14), a projection lens (17) which includes a zoom lens (16) and a focus lens (15), for projecting the optical image on a screen (2), a lens drive part (23) for adjusting the position of the zoom lens and the position of the focus lens, and a projected video control part (31) for controlling a projected video (3) projected on the screen, and the projected video control part drives the lens drive part in accordance with the aspect ratio of the input video, based on the lens position information regarding the zoom lens and the lens position information regarding the focus lens, determined by the aspect ratio of the input video in the video signal.