PURPOSE: To materialize the reduction of cost and the high manufacture accuracy of the hinge part for mounting a wing-shaped panel, and smooth the opening and closing of the wing-shaped panel, and lighten it, by sharply increasing the strength of the both right and left wing-shaped panels of a wing car, and simplify the attachment of the wing-shaped panel, in its turn, the manufacture of the wing car.

CONSTITUTION: The inner frame members 11 and 21 of the roof wall parts 3 and 3 of right and left wing-shaped panels 1 and 2 and a center fixing rib member 5 are made of hollow extrusion material, and hinge constituent parts 14, 24, 31, and 32 are made integrally, and the hollow parts 12 and 22 of the inner frame members 11 and 21 of the wing-shaped panels 1 and 2 are larger than the hollow part 6 of the rib member 5, and the rib member 5 is arranged above the steps 13 and 23 provided at the upper sidewalls 12a and 22a of the hollow parts 12 and 22 of the right and left inner fame members 11 and 21. The third hinge constituent part 31 of the rib member 5, to the first hinge constituent part 14 of the left wing-shaped panel 1, and the fourth hinge constituent part 32 of the same rib member 5, to the second hinge constituent member 24 of the left wing-shaped panel 2, are locked respectively.