An image forming apparatus for forming an image on a recording material includes a cartridge supporting member carrying a first cartridge and a second cartridge. The cartridge supporting member includes a first guide portion for guiding mounting and demounting of the first cartridge relative to a first mounting portion, and a second guide portion for guiding mounting and demounting of the second cartridge relative to a second mounting portion. When the second cartridge is dismounted from the second mounting portion, the second cartridge moves in a downstream direction with respect to a drawing direction, and wherein a distance of movement, in the downstream direction, of the second cartridge along the second guide portion from the second mounting portion until the second cartridge is dismounted is greater than a distance of movement, in the downstream direction, of the first cartridge along the first guide portion from the first mounting portion until the first cartridge is dismounted.