A boat drain valve which incorporates a valve to open and close the drain valve. The resonator circuit portion includes a piezoelectric substrate including LiNbO3 or LiTaO3, an elastic wave resonator including an electrode located on the piezoelectric substrate, and a bandwidth extending inductance Lx, Lx connected to the elastic wave resonator. The semiconductor element and the capacitor are mounted on the package substrate. The exposure holes are each filled with an electrically conductive linker.