To provide door hinge structure which holds back a door from lowering in relation to a machine opening.

The opening end edge of a machine body 10 and one side of a door member are closably connected to each other through a hinge plate 1 and a hinge pin 2. In this case, abutting face sections A and B applied with surface roughening are provided in the lowered face of the fixing piece section 1a of the hinge plate 1 arranged on the side of the top plate face 11 of the machine body 10 and a specified range in the corner section of the top plate face 11 in which the fixing piece 1a is arranged and fixed to each other so that resistance is generated in the sliding direction when they contact each other.