| 摘要 |
An image forming apparatus comprises, an image forming unit that forms an image on an image bearing member, and a mainframe that firmly supports and positions the image bearing member and the image forming unit, the main frame comprises two side walls which are opposed each other and substantially support the image bearing member and the image forming unit, a bottom wall to which the two side walls are rigidly connected, and at least one stay which is rigidly connected to the two side walls in the manner of leaving space from the bottom wall, wherein each of the bottom wall and the at least one stay has a box type structure having an inner hollow room.
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