Abstract: A crystal resonator plate according to one or more embodiments may include: a vibrating part; an external frame part surrounding the outer periphery of the vibrating part; and a support part connecting the vibrating part to the external frame part. A first excitation electrode is formed on a first main surface of the vibrating part. A second excitation electrode is formed on a second main surface of the vibrating part. The second excitation electrode includes a pair of parallel sides parallel to each other. The first excitation electrode includes protruding parts that protrude outward from a part between the parallel sides the second excitation electrode in plan view. The protruding parts each have an outer edge shape that is not along the parallel sides in plan view.