In order to provide complete removal of a sacrificial layer on a bottom surface of a disk during an etching process, without leaving residue, a disk type resonator of an electrostatic drive type includes a disk type resonator structure; a pair of drive electrodes at a predetermined gap from an outer peripheral portion of the disk type resonator structure and disposed at both sides of the resonator structure so as to face each other; a unit for applying an alternating current bias voltage with a same phase to the drive electrodes; and a detection unit that obtains an output corresponding to an electrostatic capacitance between the disk type resonator structure and the drive electrodes. The disk type resonator structure has a through hole in the center of the disk and is vibrated in a wineglass mode.