A frame that prevents the decrease in the exposure area by preventing the frame from curving inward by the tensile force of the pellicle membrane and makes it possible to obtain a pellicle having excellent dimensional accuracy and attachment position accuracy on a photomask, and a pellicle for photolithography using the frame. A pellicle frame of the present invention comprises, in at least one pair of opposite side members of a generally rectangular frame body, a portion with an arc form curved outward in the center portion of the side members, portions with an arc form curved inward on both sides of the portion curved outward, and portions with a straightly linear form on the outer sides of the portions curved inward. The radius of the portions with an arc form curved inward is preferably 1/3 or larger of the radius of the portion with an arc form curved outward.