Elastic wave device

An elastic wave device comprising:

• a support substrate;
• a piezoelectric thin film directly on or indirectly above a first primary surface of the support substrate;
• interdigital transducer electrodes on the piezoelectric thin film;
• wiring layers electrically coupled to the interdigital transducer electrodes;
• an insulating layer on the first primary surface of the support substrate, the insulating layer surrounding the piezoelectric thin film;
• a spacer layer at least a portion of which is on the insulating layer, the spacer layer surrounding the piezoelectric thin film when viewed in a thickness direction of the support substrate;
• and
• a cover on the spacer layer, the cover being spaced apart from the interdigital transducer electrodes in the thickness direction;
• wherein
• the spacer layer includes an outer edge and an inner edge closer than the outer edge to the piezoelectric thin film in plan view;
• and
• a first primary surface of the insulating layer, closer to the spacer layer, including a sloping region that extends in a region in which the insulating layer overlaps the spacer layer in plan view and in which a distance from the first primary surface of the support substrate in the thickness direction increases from the outer edge toward the inner edge.