PROBLEM TO BE SOLVED: To provide an unsealing seal member which is not broken by the impact and the vibration in physical distribution. ;SOLUTION: This member is provided with a first sheet member 42A sealing the aperture part 21BA of a developer housing part 21BG and a second sheet member 43B bonded to the first sheet member 42A so as to tear off the sheet member 42A along the aperture part 21BA. Then, the first and the second sheet members 42A and 43B are bonded by a rectangular bonding part 45 continued by four sides formed along the aperture shape of the aperture part 21BA. The rectangular joining part 45 is provided with circular-arc joining parts 45a at the corner parts where the adjacent sides are orthogonally crossed.;COPYRIGHT: (C)2000,JPO
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