Abstract: A projection type video display apparatus having a projection lens opening (3) formed in the front end (1a) of the apparatus and a lend adjustment opening (5) formed in one end adjacent the front end, both openings protected against dust and external mechanical shocks. The projection type video display apparatus is adapted to project an image that is generated by modulating light emitted from a light source based on video signals, through a projection lens unit (2) exposed in the projection lens opening (3). The apparatus comprises lens adjustment members (e.g. adjustment dial 4) for zooming and/or focusing the projection lens unit (2), and a cover mechanism (slide cover 7) for opening and closing the projection lens opening (3) and lend adjustment opening (5).