To provide an earth connection device for an electric welder, which can easily connect a welding earth terminal to a base material without being affected by a connecting position.

The earth connection device is a connecting device for pushing a connecting electrode to one side of a workpiece. The connecting electrode is composed of a plurality of electrically conductive thin laminated band plates 3. The connecting electrode is bent in a bow shape and the projection side of the bow shape is brought into contact with the workpiece. As a result, a sufficient contact area can be secured by the elastic deformation of the band plates depending on the profile of the workpiece even if the workpiece has undesirable undulation. Therefore, the electric conduction is secured and the stable welding becomes possible.