Elastic wave apparatus

An elastic wave apparatus comprising:

• a piezoelectric substrate;
• and
• an IDT electrode provided on the piezoelectric substrate;
• wherein
• the IDT electrode includes:
• first and second busbars that face each other;
• a plurality of first electrode fingers, each including one end connected to the first busbar;
• a plurality of second electrode fingers, each including one end connected to the second busbar, the second electrode fingers being interdigitated with the first electrode fingers;
• a plurality of first dummy electrode fingers, each including one end connected to the first busbar and facing a distal end of a corresponding one of the second electrode fingers with a gap therebetween;
• and
• a plurality of second dummy electrode fingers, each including one end connected to the second busbar and facing a distal end of a corresponding one of the first electrode fingers with a gap therebetween;
• at least one finger of at least one of the first and second electrode fingers or at least one of the second and first dummy electrode fingers includes a distal end having a width less than a width of another portion of the at least one of the first and second electrode fingers or at least one of the second and first dummy electrode fingers including the distal end;
• and
• a first straight line and a second straight line are at different positions in an elastic wave propagation direction, the first straight line passing through a center or approximate center of the distal end of one of the first and second electrode fingers in a width direction and extending parallel or substantially parallel to the direction in which the first and second electrode fingers extend, the second straight line passing through a center or approximate center of the distal end of one of the second and first dummy electrode fingers in the width direction and extending parallel or substantially parallel to a direction in which the first and second dummy electrode fingers extend, the one of the second and first dummy electrode fingers facing the one of the first and second electrode fingers through which the first straight line extends.