Patent ID: 8355648

Claim:
A cartridge which is detachably attachable to an image forming apparatus main body, the cartridge comprising: a first frame member which accommodates a developer and has an opening through which the developer is fed; a sealing member which seals the opening and which is pulled out to unseal the opening; a second frame member which sandwiches the sealing member with the first frame member; a welding portion which is formed on one of the first frame member and the second frame member and adapted to weld the first frame member and the second frame member at an area outside the opening; and a sandwiching portion that (i) is formed on one of the first frame member and the second frame member, (ii) is melted at an area outside the opening and inside the welding portion, and (iii) contacts with the sealing member so as to sandwich the sealing member between the first frame member and the second frame member.