To provide a coil material connection method which does not generate any curve at a welded part as a boundary even if the rear end of a foregoing coil and the top end of a following coil are welded in a production line, and to provide a coil material connection device.

When connecting the ends of a foregoing coil 9a and the following coil 9b, the rear end 91 of a belt-like material of the foregoing coil 9a is butted to the top end 92 of the following coil 9b in the production line. The belt-like material 90 is held by a clamp mechanism 32 at the front and rear of a butted part, and a backing material 6 comprising a heat-resistant ceramic is arranged on the back side of the butted part. Then, the butted part is welded and joined by running the torch 31 of arc welding on the surface of the butted part.