An image forming system includes an image forming apparatus and a sheet conveyance apparatus attached detachably to the image forming apparatus. A guide guides the sheet conveyance apparatus to be attached to the image forming apparatus, and an urging portion urges a door toward a first position that is opened with respect to an apparatus body of the image forming apparatus in a case where the door is positioned at a second position opened further than the first position. The sheet conveyance apparatus includes a pressing portion to press the door positioned at the first position toward a closed position when the sheet conveyance apparatus is guided to be attached to the image forming apparatus.