A motor vehicle door having a door inside part (19), a door outside part (20) and a supporting panel (3) which is connected in a tight-fitting manner to the door inside part (19). The supporting panel (3) is a structural part made of a reinforced plastic, extends essentially over the surface of the door and has an edge (30, 31, 32, 33) all the way around, a first frame plate (4) and a second frame plate (5) are connected to the edge of the supporting panel (3), said frame plates being folded profiles -which extend along the vertical parts of the edge, the first limb (42, 55) being connected to the edge (30, 31) of the supporting panel (3), the door inside part (19) is a shell made of plastic with fitting surfaces (49, 83) to which the second limbs (43, 56) of the frame plates (4, 5) and the supporting panel (3) are fastened, and the door inside part (19) protrudes outward over the supporting panel (3) and forms a connecting flange (50, 63), the door outside part (20) is a skin which is fastened to the connecting flange (50, 63) by means of a fastener (59).
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