Elastic wave device and manufacturing method for the same

An elastic wave device comprising:

• a support substrate including an upper surface including a recess;
• a piezoelectric substrate including a first principal surface and a second principal surface opposing each other, and laminated to cover the recess of the support substrate from the second principal surface side;
• and
• a functional electrode provided on one of the first and second principal surfaces of the piezoelectric substrate and including at least an interdigital transducer (IDT) electrode that generates elastic waves, and through which the elastic waves propagate;
• wherein
• the recess of the support substrate is covered with the piezoelectric substrate as to define a hollow section;
• a passing-through section passing through the first and second principal surfaces of the piezoelectric substrate is provided in the piezoelectric substrate;
• the passing-through section is connected to the hollow section;
• and
• at least a portion of the passing-through section is positioned inside a minimum rectangular or substantially rectangular region encompassing an outer circumference of a region in which the functional electrode for an elastic wave device is located in plan view from the first principal surface side of the piezoelectric substrate.