<p>The present invention provides a process cartridge (20) including a developing unit (12) and a toner unit (40) detachably mountable to the developing unit (12). The developing unit (12) includes a developer casing (62) provided with an accommodating section (71) for accommodating the toner unit (40). The toner unit (40) includes a toner casing (42) and an agitating member (56) in the toner casing (42). The developer casing (62) includes a first fixing member (119) and a second fixing member (124) opposite side of the first fixing member (119) in relation to the accommodating section (71). The toner casing (42) includes a first fixed portion (144) received by and fixed to the first fixing member (119); and a second fixed portion (145) disposed at the opposite side of the first fixed portion (144) in relation to a rotation shaft (53) of the agitating member (56) and fixed to the second fixing member (124) when the toner unit (40) is attached to the developing unit (12).</p>
