Image forming apparatus and transfer device

An image forming apparatus includes a conveyance device configured to transport a conveyed object, a conveyance guide configured to guide the conveyed object to the conveyance device, a housing including a shaft support. The conveyance guide includes a rotation shaft that includes a non-circular shaft portion. The shaft support has a circular hole part and a guide slot. The circular hole part is configured to rotatably support the rotation shaft, and the rotation shaft is inserted into the shaft support through the guide slot while a flat surface of the non-circular shaft portion slides along a guide surface of the guide slot. The image forming apparatus further includes a restrictor configured to restrict movement of the rotation shaft inserted into the circular hole part of the shaft support in a direction opposite to a direction of insertion of the rotation shaft into the shaft support.