Disclosed is an image forming apparatus including an image forming apparatus member, a toner image forming unit including a housing that accommodates at least one of a toner image retainer to retain a toner image and a toner retainer to supply a toner to the toner image retainer, and a recording medium transport unit including a transport belt, having an endless shape, that is openably and closably mounted to the image forming apparatus member and transports a recording medium with being wound between a pair of support rollers provided along a transport direction of the recording medium, and a regulation member that faces the transport belt to regulate a posture of the recording medium, wherein when the recording medium transport unit is closed with respect to the image forming apparatus member, the regulation member is positioned to come into contact with the housing.