An electronic device includes: a first conductor; an insulative supporting film formed in a part on one surface of the first conductor; and a second conductor, one surface of which is opposed to the one surface of the first conductor and a part of which is supported by the supporting film. An air gap is formed in a region in which the first conductor and the second conductor are opposed to each other excluding the supporting film. The thickness of the supporting film is larger than a space between the first conductor and the second conductor, at least a part of which forms the air gap.