A semiconductor device includes: a substrate; a semiconductor element disposed on the substrate; a plurality of electrodes disposed on the substrate separately from one another and arranged so as to surround the semiconductor element in a plan view; a lid that cover the semiconductor element, the lid including an inner portion and a periphery portion that is outer than the inner portion in a plan view, the lid including a plurality of first protruding members that is provided separately from one another, the first protruding members being disposed in the inner portion; and conductive members disposed between the plurality of electrodes and the plurality of protruding members disposed in positions opposed to the plurality of electrodes respectively, the conductive members being joined to the plurality of electrodes and the plurality of protruding members respectively.