Image forming apparatus

An image forming apparatus comprising:

• a main assembly;
• a belt unit detachably mountable to said main assembly, said belt unit including a movable endless belt, a supporting roller supporting said endless, a steering unit, supporting said endless belt, for swinging said endless belt to incline relative to said supporting roller by a force produced by movement of said endless belt in a widthwise direction which crosses with a moving direction of said endless belt, and a cleaning unit, supported by said steering unit, for removing and collecting toner from said endless belt;
• an image forming station for forming a toner image on said endless belt;
• a toner receiving unit, provided in said main assembly, for receiving the toner collected by said cleaning unit;
• and
• a path member for guiding the toner collected by said cleaning unit to said toner receiving unit, said path member being supported by said main assembly when said belt unit is not mounted to said main assembly, and said path member being supported by said cleaning unit in a state that said path member is swingable relative to said toner receiving unit when said belt unit is mounted to said main assembly.