There is provided a resonator having a piezoelectric ceramic resonator
which has excellent free-fall resistance. The resonator comprises a
piezoelectric ceramic resonator 2 with a vibrating electrode formed, and
a substrate 3 which supports the piezoelectric ceramic resonator 2,
wherein the piezoelectric ceramic resonator 2 satisfies the condition of
U.gtoreq.0.88.times.H+20.28, wherein U=maximum elastic energy
(kJ/m.sup.3) per unit volume, and H=drop height (m) (H>1). The present
invention can be applied to a resonator 1, wherein the substrate 3 has
terminal electrodes 31, 32, and the piezoelectric ceramic resonator 2 is
in electrical continuity with the vibrating electrode and is supported on
the substrate 3 at both ends via a conductive stator 4.