Welded pipe manufacturing apparatus and welded pipe manufacturing method

A welded pipe manufacturing apparatus for manufacturing a welded pipe by bending a metal plate and welding butting end portions, comprising:

• a bending unit that includes a pair of bending die arrays that continuously constrain the end portions of the metal plate and a roller group that abuts against a central portion of the metal plate and supports the central portion, and bends the metal plate;
• a light emitter that emits directional light to an inner surface of the bent metal plate;
• an image capturing unit that captures light emitted by said light emitter and reflected by the metal plate;
• and
• an adjustment assistance unit that assists at least one of position adjustment of the bending die arrays and position adjustment of the roller group in accordance with a shape of the reflected light;
• wherein the roller group includes a support roller that supports the metal plate from below;
• wherein the directional light is emitted to a surface of said support roller using said light emitter, and said image capturing unit captures the light emitted from said light emitter and reflected by the surface of said support roller, and
• wherein said adjustment assistance unit assists adjustment of said bending unit based on the shape of the light reflected by the metal plate and the shape of the light reflected by the surface of said support roller.