An acoustic wave detection device comprises an interference film formed of two opposing reflective layers； a first light source configured to irradiate light to the interference film and capable of changing a wavelength of the light； a photodetector configured to detect an intensity of reflected light； a signal acquisition unit configured to acquire an electrical signal based on a change of the intensity of the reflected light； a wavelength acquisition unit configured to acquire a reference wavelength, which is a wavelength of the measurement light emitted when measurement is performed on a first point on the interference film； and a wavelength control unit configured to determine the wavelength of the measurement light emitted when the measurement is performed on a second point on the interference film based on the reference wavelength.
