Elastic wave device

An elastic wave device comprising:

• a piezoelectric film;
• a high acoustic velocity member through which an elastic wave propagates at an acoustic velocity higher than an acoustic velocity of an elastic wave that propagates through the piezoelectric film;
• a low acoustic velocity film disposed between the piezoelectric film and the high acoustic velocity member and through which an elastic wave propagates at an acoustic velocity lower than the acoustic velocity of the elastic wave that propagates through the piezoelectric film;
• and
• an interdigital transducer electrode disposed on a principal surface of the piezoelectric film;
• wherein
• the interdigital transducer electrode includes a plurality of electrode fingers that are separated from each other and that are disposed side by side in a first direction;
• at least one of the plurality of electrode fingers includes a first metal layer;
• the first metal layer includes:
• a first main body portion disposed directly or indirectly on the principal surface of the piezoelectric film;
• and
• a second main body portion disposed on the first main body portion;
• and
• the second main body portion includes:
• a recessed portion located in a central region in the first direction of the at least one of the plurality of electrode fingers and that is recessed in a thickness direction of the piezoelectric film;
• and
• a protrusion portion that protrudes from at least a portion of the first main body portion in the first direction.