Patent ID: 7501916

Claim:
An elastic wave device comprising: a piezoelectric member; and at least one IDT electrode; wherein said at least one IDT electrode has first and second electrode fingers that are arranged next to each other in a propagation direction of elastic waves and are connected to different electric potentials; a gap is provided external to tip ends of each of the first and second electrode fingers in a longitudinal direction of the electrode fingers; a projection is provided in at least one of a position on a side edge of the first electrode finger and a position on a side edge of the second electrode finger in the longitudinal direction of the electrode fingers, the position on the side edge of the first electrode finger corresponding to that of the gap located external to the tip end of the second electrode finger in the longitudinal direction of the electrode fingers, the position on the side edge of the second electrode finger in the longitudinal direction of the electrode fingers corresponding to that of the gap located external to the tip end of the first electrode finger in the longitudinal direction of the electrode fingers; and the projection projects only in the vicinity of the gap from the side edge of one of the first and second electrode fingers in a direction towards the gag provided at the tip end of another one of the first and second electrode fingers, the side edge from which the projection projects being one of the side edges that faces the gap.