The present invention provides an imaging forming apparatus capable of inhibiting paper jam, or poor fixation or poor image quality caused by curling of transfer materials, when the transfer materials are transmitted. The image forming apparatus comprises a transfer belt for transfer images; a roller around which the transfer belt is wound; a secondary transfer roller for transfer images on the transfer materials via forming a transfer nip by the butting between a belt driving roller and a transfer belt; a transfer material transporting unit for vertically upwardly sucking the transfer material, and transporting the transfer material with the image vertically down; a guide part which vertically upwardly sucks the transfer material transported by the transfer material transporting unit; a fixing nip comprising a heating roller and a pressing roller and between the heating roller and the pressing roller; a fixing part for transporting the transfer material guided by the guide part and fixing the images; and an airflow generating part for generating the airflow for absorbing the transfer material in a vertical direction.