An electronic component contained substrate in which an electronic component is mounted between a pair of wiring substrates, wherein the wiring substrates are connected electrically via solder balls, an opening portion opened larger than a planar shape of the electronic component is formed in the other wiring substrate, which faces to one wiring substrate on which the electronic component is mounted, in a position that opposes the electronic component, and a space between a pair of wiring substrates is sealed with a sealing resin.