Problem to be solved: To solve the problem that a conventional photo mask storage case cannot store a plurality of types of photo masks and lacks general-purpose properties. [Means for solving the problem] a photo mask storage case of the present invention comprises a lower case portion and an upper case portion that closes the lower case portion, and at four corners of an upper surface of a bottom plate portion of the lower case portion, The lower case part is provided with a positioning placement part that is movable in a lateral direction and places and positions the corner part of the photo mask to be stored, and each positioning placement part is fixed at a desired position with respect to the lower case part. The desired position is characterized in that the center position in the horizontal direction of the photo mask placed on a positioning placement part...

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