IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To obtain an image forming apparatus capable of suppressing fluctuations of a size of a gap provided between an image holder and a developing member, when an image forming unit is attached to an apparatus body.SOLUTION: It happens that a rubber tube 122 is contracted in the extension direction of a toner conveyance path 98 to absorb a relative positional deviation between a receiving port 84 and a supply port 110. A top end of the toner conveyance path 98 is extended toward a developing roll 72 and an image holder 18 to press a roller member 78 against the image holder 18 by such a force that the rubber tube 122 tries to elastically return and acts on a developing device 22. Thus, when an image forming unit 16 is attached to an apparatus body 10A, fluctuations of a size of a gap provided between the image holder 18 and the developing roll 72 are suppressed.