Acoustic wave device and communication apparatus

An acoustic wave device comprising:

• a piezoelectric substrate comprising a first surface;
• a plurality of electrodes which are located on the first surface and excite acoustic waves;
• an insulating cover located on the first surface configuring one or more spaces above the plurality of electrodes;
• a common terminal, first terminal, and second terminal which are all located on the first surface and pass through the cover;
• and
• a reinforcing layer which is located on the cover, is made of metal, and is connected to a reference potential,
• wherein
• by the plurality of electrodes,
• a first filter which is located in a first signal path connecting the common terminal and the first terminal and
• a second filter which is located in a second signal path connecting the common terminal and the second terminal are configured,
• the reinforcing layer comprises
• a first area part which faces the first filter and the second filter, and
• a second area part which faces the second filter and is separated from the first area part,
• the second filter comprises a first resonator and second resonator,
• the first area part faces the first resonator in addition to the first filter, and
• the second area part faces the second resonator.