Manufacturing device for bent pipe and method of manufacturing bent pipe

A manufacturing device for a bent pipe by which the bent pipe is obtained by bending a double pipe with a first pipe and a second pipe containing therein the first pipe, the manufacturing device comprising:

• an inner core metal configured to be placed in the first pipe;
• an intermediate core metal configured to be placed between the first pipe and the second pipe;
• a bending mold configured to bend the double pipe;
• and
• a controller,
• wherein the controller is configured to execute:
• a first bending process in which the first pipe and the second pipe are bent by the bending mold in a first direction in a first area of the double pipe where the inner core metal and the intermediate core metal are placed;
• a second bending process in which the first pipe and the second pipe are bent, after the first bending process, by the bending mold in a second direction in a second area of the double pipe where the inner core metal and the intermediate core metal are placed;
• and
• a first bending-back process in which the second pipe is bent, after the first bending process, in a direction opposite to the first direction in the first area.