<p>It is an object to provide an elastic wave device that makes it possible to improve a resonance characteristic in the vicinity of a resonance frequency and is hard to cause a short-circuit malfunction or a deterioration in insulation between interdigital electrodes. An elastic wave device is comprised of an IDT electrode (3) that is formed in contact with a piezoelectric member and has a plurality of electrode fingers. The fingers include first and second electrode fingers (31, 32) that are provided side by side in an elastic wave transmitting direction and are connected with different potentials and a first dummy electrode finger (34) provided opposite to the first finger (31) through a gap (33) disposed at the outside in a longitudinal direction of the first electrode finger (31), and first convex portions (11)-(14) projecting from side edges of at least one electrode finger to the elastic wave transmitting direction in at least one of the first electrode finger (31) and the first dummy electrode finger (34) are formed in the vicinity of the gap.</p>
