Abstract: A laminate is formed by overlapping at least a part of a first member and at least a part of a second member. The first member and the second member are joined by irradiating the laminate with a laser. The first member contains aluminum. The second member contains copper. The second member includes a first main surface and a second main surface. The second main surface is an opposite surface of the first main surface. A contact portion is provided due to contact of the first main surface with the first member. The second main surface is irradiated with the laser. A temperature of the contact portion is equal to or higher than an eutectic point temperature of Al and Cu and lower than a melting point of Cu.