A magnetic information medium recording/reproducing device may include a turnable drum whose outer peripheral face forms a medium feeding path for a magnetic information medium and a feeding mechanism for carrying the medium along the outer peripheral face of the drum while pressing the medium against the outer peripheral face of the drum. The drum may be formed in a hollow cylindrical shape having an inner peripheral wall and a plurality of inner support rollers are disposed for supporting the drum from the inner peripheral wall side of the drum. The drum may be held by the inner support rollers and the feeding mechanism, and one of the inner support rollers may be disposed near a magnetic head and may be urged against the inner peripheral wall of the drum.