A screen unit includes a screen, a screen holding unit which holds the upper end of the screen, a screen winding unit around which the screen is wound, a pantograph mechanism which expands and stores the screen, and adjusting units which control the position of the upper end of the screen when the screen is expanded. The adjusting units have a support member which has a screw portion, and an adjusting screw member rotatably provided on the corresponding support member. The support member shifts in accordance with rotation of the adjusting screw member.