A socket-side terminal includes: a root section that is fixed to a conductive wiring pattern on the main surface of a circuit wiring substrate by using solder; a rising section rising up from the root section and spaced apart from the main surface; an inverted U-shaped section one end of which is continuous with the top end of the rising section; a falling section that extends from the other end of the inverted U-shaped section towards the main surface; an inclined section that, as the inclined section extends from the bottom end of the falling section towards the main surface, is inclined with respect to the main surface to be spaced apart from the rising section; and an opposing section that is continuous with the bottom end of the inclined section, is positioned so as to be opposing the falling section, and is in contact with a header-side terminal.