A developer accommodating container includes first and second members, and first and second seals. The first member includes one end portion and the other end portion in a first direction. At least a part of the one end portion of the first seal is nipped between the first member and the second member in a state of being superposed on the second seal. The one end portion of the first seal includes first, second, third, and fourth ridge lines. At least one of a first corner formed by the first ridge line and the second ridge line and a second corner formed by the third ridge line and the fourth ridge line is nipped between the first member and the second member so as to be elastically deformed in a state of being superposed on the second seal.