A low-cost memory card. It is an electronic device having a substrate with a wiring exposing external electrode terminals from a first face, a sealing section comprising an insulating resin so provided as to cover the whole of a second face serving as the back of the first face, and one or more semiconductor elements covered with the sealing section, fixed on the second face of the substrate, and an electrode of which is electrically connected to the wiring via a connecting means. The substrate is square and constitutes a card-type package together with the sealing section. The substrate has one or more semiconductor elements constituting a memory chip and a control chip for controlling the memory chip fixed to constitute a memory card. The edges of the substrate and the sealing section are provided with a directionality recognizing section.
