The present invention addresses the problem of providing an electronic device that is provided with a sealing layer having high gas barrier performance, and a method for sealing the electronic device using the sealing layer. This electronic device has, on a base material, a functional element and a sealing layer that seals the functional element. The electronic device is characterized in that the sealing layer is a laminated body, which is configured from a first gas barrier layer containing the oxide of a Group 12-14 non-transition metal (M1), and a second gas barrier layer containing the oxide of a transition metal (M2) disposed in contact with the first gas barrier layer, or the sealing layer is a gas barrier layer containing the composite oxide of the non-transition metal (M1) and the transition metal (M2), or the sealing layer has a region containing the composite oxide.