The present invention relates to a case that can house an image pickup apparatus or the like and can be used as a cover of the image pickup apparatus for preventing the adhesion of water droplets to the image pickup apparatus during shooting. The case according to the present invention a first cover portion 20 and a second cover portion 21, and an outer periphery of the first cover portion has the same length as an outer periphery of the second cover portion. The first cover portion and the second cover portion change between a first state where the outer peripheries of the first cover portion and the second cover portion are joined to each other so as to provide a space inside and a second state where the outer peripheries of the first cover portion and the second cover portion are separated from each other with the outer peripheries being partially fixed to each other so that the outer peripheries as a whole assume a substantially T-shape.