A cover open/close mechanism, which is included in an image forming apparatus, includes a cover having a free end and disposed movable between a closed state that a part of the apparatus body is covered and an open state that the covered part is exposed, a cover rotating shaft about which the cover rotates in a receding direction when the cover moves from the closed state to the open state, a support member rotating shaft disposed parallel to the cover rotating shaft, a cover rotating shaft support member to support the cover rotating shaft and to change a position of the cover rotating shaft with respect to the apparatus body by rotating about the support member rotating shaft, and a biasing member to bias the cover rotating shaft support member in a manner in which the cover rotating shaft support member rotates in an approaching direction.