To provide an electronic device that prevents an oscillating frequency from fluctuating.

An electronic device includes: a device-equipped member having a first concave part and a second concave part, in which one copper plate connection terminal for heat transmission and three external connection terminals are provided on a side of the second concave part; a piezoelectric vibrating device that is housed in the first concave part and has an excitation electrode on both main surfaces of a piezoelectric element plate; an integrated circuit device that is housed in the second concave part and provided with at least an oscillating circuit; a lid member for sealing the first concave part; and a copper plate for heat transmission that is bonded to a side of the second concave part of the device-equipped member. One surface of the copper plate for heat transmission, a circuit-forming surface of the integrated circuit device and its opposite side surface are connected via an electrically-conductive adhesive, and the copper plate for heat transmission is connected with the copper plate connection terminal for heat transmission.

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