Developer storage body including frame body having contact surface with holes and seal member contacting contact surface

A developer storage body comprising:

• a frame body storing a developer;
• a rotating member a part of which is inserted into a hole portion provided in the frame body, the rotating member agitating or conveying the developer in the frame body;
• and
• a seal member held between the frame body and the rotating member in a direction of a rotation axis of the rotating member,
• wherein the frame body has a contact surface in contact with the seal member, and
• wherein the contact surface has:
• a first contact region in which a plurality of holes are formed and arranged in a circumferential direction about the rotation axis, and first contact portions are each formed between two of the plurality of holes adjacent to each other, the first contact region restricting a movement of the seal member relative to the frame body, and
• a second contact region formed at a region different from the first contact region in a radial direction about the rotation axis, the second contact region restricting leakage of the developer from inside to outside of the frame body through the hole portion,
• wherein the plurality of holes have depths in the direction of the rotation axis from the contact surface, and
• wherein a portion of the seal member enters into at least one of the plurality of holes in the direction of the rotation axis.