| 摘要 |
To provide an improvement capable of simplifying an operation for installing an additionally installable apparatus. An image forming apparatus comprises a apparatus main body 11 and at least one additionally installable apparatus, in which one additionally installable apparatus is detachably disposed to a main body side device composed at least of the apparatus main body 11. The additionally installable apparatus has a positioning member at a surface facing to the main body side device. The main body side device has a receiving portion configured to receive the positioning member at a surface facing to the additionally installable apparatus and a guiding member 22 for guiding the positioning member to the receiving portion. Due to an operation in which the apparatus main body 11 is held down for the purpose of establishing contact between the guide member 22 and the positioning member and a fine adjustment is made after establishing contact therebetween to cause the positioning member fit into the receiving portion, thereby achieving positioning of the additionally installable apparatus, high positioning accuracy during the initial operation is not required.
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