Image recording apparatus wherein a film is exposed to a laser beam so that an image is recorded on the film, the apparatus having a cartridge for winding the image-recorded film. The cartridge comprises a reel, a first and a second casing for housing the reel in such a manner as the reel can be dismounted, the casings capable of being integrated and disintegrated by moving in a direction perpendicular to the axis of the reel, a first guide unit disposed in the first casing for forcing the film wound around the reel toward the center of the reel elastically and a second guide unit disposed in the second casing for forcing the film wound around the reel toward the center of the reel.