To provide the arc welding terminal of a small transformer, capable of protecting its molded holder against deformation or burning due to welding heat.

A projection, a recessed part, or a thickened part is provided to the welding terminal 1 of a small transformer for the formation of a stepped part 2, a linear welding member 3 as a transformer winding terminal is wound on the top side of the stepped part 2, and an arc welding operation is carried out separated from the molded resin holder 4 by a certain gap, so that a melt zone is restrained from coming into direct contact with the molded resin holder 4. Therefore, a resin molded holder is given no heat directly and is protected against deformation or burning, and an arc welding terminal 1 ensuring high welding strength can be provided.