it impossible to separate the process cartridge 1 and toner cartridge 2 from each other unless the two cartridges are moved relative to each other in the direction in which they are installed or removed that is unless the first shutter 27 is blocking the toner discharging hole 23 further the ribs 56 and 58 of the toner cartridge 1 and process cartridge 2 that is the portions by which the process cartridge 1 and toner cartridge 2 are guided when the process cartridge 1 and toner cartridge 2 are installed into the apparatus main assembly respectively may be provided with ribs 57 and 59 so that the two cartridges are prevented by a pivoting member 60 as a removal controlling means illustrated in fig1 from being removed at the same time more specifically the pivoting member 60 is pivotally supported by the apparatus main assembly and its widest portion in terms of the vertical direction of the drawing is rendered wider than the gap between the ribs 57 and 59 as shown in fig1 b thus as the toner cartridge 2 is moved in the direction of an arrow mark e the pivoting member is pressed down by the rib 59 of the toner cartridge 2 preventing thereby the rib 57 of the process cartridge 1 from moving in the direction of the arrow mark e as a result the process cartridge 1 is prevented from moving in the direction of the arrow mark e since the first.