Terminal fixing method

A terminal fixing method for fixing one or more terminals to a plurality of lands provided on a substrate by laser welding, comprising:

• constructing the plurality of lands by one or more terminal installation lands on which the terminals are installed and one or more dummy lands on which no terminals are installed each larger than each of the terminal installation lands;
• and
• irradiating divided laser beams emitted from a laser oscillator toward two or more lands the plurality of lands so as to execute the laser welding, wherein
• the two or more lands include two or more terminal installation lands, or one or more terminal installation lands and the one or more dummy lands,
• each of the dummy lands comprises:
• a front surface dummy land provided on one surface in a thickness direction of the substrate and on which no terminals are installed;
• and a rear surface dummy land provided on other surface in the thickness direction of the substrate and on which no terminals are installed, and
• the front surface dummy land and the rear surface dummy land are mutually connected by a connection part penetrating the substrate.