Acoustic wave device

An acoustic wave device comprising:

• a substrate;
• an acoustic wave element on a main surface of the substrate;
• at least one line on the main surface of the substrate, the at least one line comprising a first portion;
• a cover which covers the acoustic wave element and the at least one line, wherein
• at least one first space which houses the first portion, but does not house the acoustic wave element is located between the main surface of the substrate and the cover, and
• the first portion is at an intermediate position in the at least one line, and
• at least one opposite side line on the main surface of the substrate;
• wherein
• the acoustic wave element is located between one of the at least one opposite side line and one of the at least one line in a direction intersecting with a propagation direction of an acoustic wave,
• the cover covers the at least one opposite side line,
• a second space which houses a portion of the opposite side line is located between the cover and the main surface of the substrate,
• the first space, the acoustic wave element, and the second space are arranged in that order in the direction intersecting with the propagation direction of the acoustic wave, and
• the first space and the second space are isolated.

An acoustic wave device, comprising:

• a substrate;
• two acoustic wave elements on a main surface of the substrate;
• at least one line on the main surface of the substrate, the at least one line electrically connecting the two acoustic wave elements and comprising a first portion;
• and
• a cover which covers the two acoustic wave elements and the at least one line;
• wherein
• at least one first space which houses the first portion, but does not house any of the two the acoustic wave elements is located between the main surface of the substrate and the cover, and
• the cover comprises a frame configuring an inner wall of the first space and a lid laid over the frame, wherein the frame is made of resin.