Elastic wave device and method of manufacturing the same

A method of manufacturing an elastic wave device, comprising:

• a step of preparing elastic wave elements each including a piezoelectric substrate including a first main surface and a second main surface facing the first main surface, an IDT electrode disposed on the second main surface of the piezoelectric substrate, a support disposed on the second main surface of the piezoelectric substrate so as to surround the IDT electrode in a plan view from a second main surface side of the piezoelectric substrate, and a cover that is disposed on the support and seals the IDT electrode together with the support and the piezoelectric substrate, and a mother mounting substrate that includes an upper surface and a lower surface on which a terminal electrode is disposed;
• a step of mounting the elastic wave elements above the upper surface of the mother mounting substrate such that the cover and the upper surface of the mother mounting substrate face each other at an interval;
• a step of disposing the mother mounting substrate, after the elastic wave elements have been mounted above the upper surface of the mother mounting substrate, in an interior space defined by a first mold and a second mold;
• a step of supplying a fluid sealing resin to the interior space and onto the upper surface of the mother mounting substrate so as to seal the elastic wave elements while pressurizing the sealing resin until each cover has curved toward a piezoelectric substrate side;
• a step of curing the sealing resin;
• and
• a step of dividing the mother mounting substrate and the sealing resin into individual pieces.