In an elastic wave device including an input side electrode and an output
side electrode being a resonant single-phase unidirectional transducers
(RSPUDT) provided with respective pairs of bus bars opposing to each
other on a piezoelectric substrate and a number of excitation electrode
fingers extending in a comb-teeth shape so as to respectively cross each
other from the respective bus bars, the elastic waves are repeatedly
reflected and amplified between the central part of the input side
electrode and the central part of the output side electrode along the
direction of extension of the respective bus bars by the excitation
electrode fingers of the input side electrode and the output side
excitation electrode, the elastic wave device includes a damper at least
on either one of the input side bus bar or the output side bus bar in an
area between the central part of the input side electrode in the
direction of movement of the elastic waves and the central part of the
output side electrode in the direction of movement of the elastic waves
so that the energy leaked out into the bus bar is absorbed.