Manufacturing method of joined member

A method of manufacturing a joined member, the joined member being manufactured by holding a workpiece comprising stacked plate materials between a first electrode and a second electrode, and applying resistance welding to the workpiece,

• a first plate material in the workpiece that makes contact with the first electrode being provided with a plating layer on a side to be in contact with the first electrode, and a second plate material in the workpiece that makes contact with the second electrode being provided with a plating layer on a side to be in contact with the second electrode,
• the first plate material and the second plate material being included in the stacked plate materials,
• the method comprising:
• pressurizing the workpiece without energization to the workpiece such that a surrounding area of a pressurized portion of the first plate material and a pressurized portion of the second plate material rise outward and are deformed and such that a gap is generated between the first plate material and the second plate material, thereby forming a first area in the first plate material, the first area being curved along a contour of a leading end of the first electrode, and a second area in the second plate material, the second area being curved along a contour of a leading end of the second electrode;
• and
• in a state in which the first electrode is in contact with the first area in the first plate material and in which the second electrode is in contact with the second area in the second plate material, starting energization between the first electrode and the second electrode to form a nugget.