| 摘要 |
A developing device includes: a housing that has a developer containing part and an opening, the developer containing part containing a developer, and the opening allowing the developer to flow through; a sheet member that is provided in the housing, seals the opening when unused, and is pulled out in one direction to open the opening when used; and a loosening regulation unit that is provided on the housing or the sheet member, and regulates loosening of the sheet member, wherein the housing has a guide hole, the guide hole allowing the sheet member to be inserted in when sealing the opening with the sheet member, and guiding the sheet member when the sheet member is pulled out. |
