To provide a seam welding machine capable of easily welding the inside R of a circular or curved work even when the inside R is small.

In the seam welding machine, the lower part of a cylinder at the upper part is provided with an angle plate, the space between the angle plate and a housing at the upper part is provided with an angle regulation plate; the housing at the upper part is provided with a flange-fitted spacer; the flange-fitted spacer is provided with an electrode; the space between a frame at the lower part and a housing at the lower part is provided with an angle regulation plate; the housing at the lower part is provided with a flange-fitted spacer, and the flange-fitted spacer is provided with an electrode.

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