Patent ID: 7825340

Claim:
A double-sided wiring board provided with a connecting device serving as a connecting region to be connected to the outside, the double-sided wiring board comprising: an insulating substrate, a plurality of substrate holes being formed in the insulating substrate for a single said connecting device, a first-side conductive layer formed on a first side of the insulating substrate, a second-side conductive layer formed on a second side opposite the first side, and a first-side connecting conductive layer that is laminated on the first-side conductive layer and that connects the first-side conductive layer and the second-side conductive layer to each other within each of the substrate holes, the second-side conductive layer protruding into each of the substrate holes, wherein the connecting device comprises a first-side connecting land portion configured by the first-side conductive layer and the first-side connecting conductive layer and a second-side connecting land portion configured by the second-side conductive layer, the first-side connecting land portion and the second-side connecting land portion face each other with the insulating substrate sandwiched therebetween, each of the substrate holes is formed to include a peripheral end portion of the first-side connecting land portion and a peripheral end portion of the second-side connecting land portion, and the peripheral end portion of the first-side connecting land portion and the peripheral end portion of the second-side connecting land portion protrude into each of the substrate holes and are connected to each other within the substrate hole.