To obtain a hinge fixing structure which does not need projecting and recessed parts in the cabinet of a main body device when a hinge to which a hard cover is attached is detached from the main body device.

A part 4 for main body fixing for fixing a hinge part 3 is turnably connected to a main body fixing side corresponding to the opposite side from a side to which the hard cover 2 of the part 3 to a main body device, key-shaped projections (a) provided in the part 4 is made to engage with the main body device by sliding the part 4 to the main body after inserting the part 4 into the notch part of the housing of the main body device, and this structure is realized by fixing the part 4.