IMAGE FORMING APPARATUS

An image forming apparatus includes a rotatable belt member, a first stretch roller, a second stretch roller, a rotary member, a conveyance roller, a pressing member, a driving source, and a control unit. The pressing member moves between a first position and a second position at which the pressing member projects to a conveyance path of the recording material than the first position. The driving source drives the pressing member. The control unit controls the driving source such that the pressing member is positioned at the first position if a basis weight of the recording material conveyed to the transfer nip portion is equal to or smaller than a predetermined value and the pressing member is positioned at the second position if the basis weight of the recording material conveyed to the transfer nip portion is greater than the predetermined value.