Patent ID: 8411455

Claim:
A mounting structure in which an electronic component is surface-mounted with Sn—Ag—Bi—In-based solder onto a wiring that is formed in a predetermined pattern on a wiring substrate, the Sn—Ag—Bi—In-based solder comprises 0.1% by weight or more and 5% by weight or less of Bi, and more than 3% by weight and less than 9% by weight of In, the balance being made up of Sn, Ag and unavoidable impurities, the wiring substrate has a coefficient of linear expansion of 13 ppm/K or less in all directions, a solder resist having a smaller thickness than the wiring is formed on the same surface of the wiring substrate on which the wiring is formed; and the solder resist is made of a resin composition containing a thermosetting epoxy resin as a main component and containing an acrylic resin as an additive.