A method of manufacturing a welded article, comprising the steps of: providing a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides; providing a second welding target member to be bonded to the first welding target member by welding; and bringing the projection portion into contact with the second welding target member and bonding the first and second welding target members (1, 2) by resistance welding, characterized in that: the projection portion has subdividing grooves (V1, V2) in the direction of the short sides to form subdivided projection portions (P1-P3) in order to improve the uniformity of current values in the direction of the long sides of welding currents flowing through the subdivided projection portions (P1-P3); the subdivided projection portions (P1-P3) having side walls extending in parallel in a direction perpendicular to the welding target portion, the subdividing grooves (V1, V2) having side walls extending in parallel in a direction perpendicular to the welding target portion into a part of the first welding target member located adjacent to the projection portion, wherein the subdividing grooves (V1, V2) are formed beyond the projection portion and extend in parallel from the projection portion deeply into said part adjacent to the projection portion, wherein the said part is located adjacent to the projection portion P and does not contribute to welding; and wherein the first welding target member has two end portions in the direction of the long sides. providing a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides; providing a second welding target member to be bonded to the first welding target member by welding; and bringing the projection portion into contact with the second welding target member and bonding the first and second welding target members (1, 2) by resistance welding, characterized in that: the projection portion has subdividing grooves (V1, V2) in the direction of the short sides to form subdivided projection portions (P1-P3) in order to improve the uniformity of current values in the direction of the long sides of welding currents flowing through the subdivided projection portions (P1-P3); the subdivided projection portions (P1-P3) having side walls extending in parallel in a direction perpendicular to the welding target portion, the subdividing grooves (V1, V2) having side walls extending in parallel in a direction perpendicular to the welding target portion into a part of the first welding target member located adjacent to the projection portion, wherein the subdividing grooves (V1, V2) are formed beyond the projection portion and extend in parallel from the projection portion deeply into said part adjacent to the projection portion, wherein the said part is located adjacent to the projection portion P and does not contribute to welding; and wherein the first welding target member has two end portions in the direction of the long sides. the projection portion has subdividing grooves (V1, V2) in the direction of the short sides to form subdivided projection portions (P1-P3) in order to improve the uniformity of current values in the direction of the long sides of welding currents flowing through the subdivided projection portions (P1-P3); the subdivided projection portions (P1-P3) having side walls extending in parallel in a direction perpendicular to the welding target portion, the subdividing grooves (V1, V2) having side walls extending in parallel in a direction perpendicular to the welding target portion into a part of the first welding target member located adjacent to the projection portion, wherein the subdividing grooves (V1, V2) are formed beyond the projection portion and extend in parallel from the projection portion deeply into said part adjacent to the projection portion, wherein the said part is located adjacent to the projection portion P and does not contribute to welding; and wherein the first welding target member has two end portions in the direction of the long sides.