To enable mass production at a low cost while improving productivity by manufacturing gate doors and a fence of cast panels having the same shape.

A cast panel 3 for forming a main body part of a fence 1 and a cast panel 3 for forming a main body of gates 2 are formed into the same shape. Both sides of the cast panels 3 are fixed to a support 4 by an L-shaped joint fitting so as to form a fence 1. An H-shaped hanging style 7 made of the aluminum mold is fixed to one side of the cast panel 3. A door stop style 11 formed of an aluminum mold and provided with a locking fitting and a latch bar device is fixed to the other side of the cast panel 3 so as to form a door body 6. The hanging style 7 of the door body 6 is stretched from a gatepost 12 by a hinge fitting so as to form a double-hinged gate door 2 provided with symmetrical door bodies 6 in right and left, and the fence 1 and the gate doors 2 are combined so as to formed an outer fence. With this structure, productivity in factory is improved so as to enable the mass production at a low cost.