Full-contact type exposure device

The invention provides a full-contact type exposure device that allows high adherence of a photo mask with a board. Upon completion of prescribed processing such as positioning, a controller 99 controls a moving mechanism 21 to move a platen 20 upward, thereby moving the photo mask 1 and a board 2 closer, and to stop at a position where a sealed space is formed between the two. At the same time a controller 99 starts vacuuming by controlling a vacuum pump 51. By this vacuum the pressure in the space between the photo mask 1 and board 2 becomes negative, and the photo mask 1 bends downward with its center area sagging and contacting the board 2. The controller 99 controls a cam drive mechanism 31 to rotate cams 30 while vacuuming, allowing the photo mask 1 to gradually make contact with the board 2 from the center area to its periphery while pushing out the air gradually from the center to the periphery, thereby completing full contact with the board 2.