A waste powder recovery container is detachably attached to an image forming apparatus, and further, is provided with a recovery port, through which waste powder discharged from a component part constituting a process unit is recovered, at one end in a longitudinal direction and an inclined surface on the container side, which is gradually inclined downward in a lateral direction and has the recovery port formed thereat. The inclined surface on the container side moves an opening/closing member disposed in a discharging portion formed at the component part constituting the process unit by pushing an inclined surface on a main body side formed at the opening/closing member, thereby opening a discharging port formed at the discharging portion, to discharge the waste powder and recover the waste powder through the recovery port.