An audio signal processing device comprising: an audio signal processing unit configured to perform signal processing on an audio signal; a sound volume setting receiving unit configured to receive a sound volume set value; a sound volume measuring unit configured to measure a sound volume at a listening position; a level detection unit configured to detect a level of an input signal, the input signal being the audio signal input to the signal processing unit ; wherein: the audio signal processing unit is configured to perform a loudness correction which increases a level of the audio signal in a prescribed frequency range as the sound volume set value decreases; the sound volume measuring unit is configured to measure sound volumes corresponding to plural respective sound volume set values at the listening position; the audio signal processing unit is configured to set a level adjustment amount to be used in performing the loudness correction on the basis of the level of the input signal detected by the level detection unit , the sound volume set value received by the sound volume setting receiving unit and the measurement sound volumes measured by the sound volume measuring unit , such that if the audio signal level varies to a large extent in a single piece, a phenomenon can be prevented that high-frequency components and low-frequency components are less audible when the sound volume is small. an audio signal processing unit configured to perform signal processing on an audio signal; a sound volume setting receiving unit configured to receive a sound volume set value; a sound volume measuring unit configured to measure a sound volume at a listening position; a level detection unit configured to detect a level of an input signal, the input signal being the audio signal input to the signal processing unit ; wherein: the audio signal processing unit is configured to perform a loudness correction which increases a level of the audio signal in a prescribed frequency range as the sound volume set value decreases; the sound volume measuring unit is configured to measure sound volumes corresponding to plural respective sound volume set values at the listening position; the audio signal processing unit is configured to set a level adjustment amount to be used in performing the loudness correction on the basis of the level of the input signal detected by the level detection unit , the sound volume set value received by the sound volume setting receiving unit and the measurement sound volumes measured by the sound volume measuring unit , such that if the audio signal level varies to a large extent in a single piece, a phenomenon can be prevented that high-frequency components and low-frequency components are less audible when the sound volume is small. the audio signal processing unit is configured to perform a loudness correction which increases a level of the audio signal in a prescribed frequency range as the sound volume set value decreases; the sound volume measuring unit is configured to measure sound volumes corresponding to plural respective sound volume set values at the listening position; the audio signal processing unit is configured to set a level adjustment amount to be used in performing the loudness correction on the basis of the level of the input signal detected by the level detection unit , the sound volume set value received by the sound volume setting receiving unit and the measurement sound volumes measured by the sound volume measuring unit , such that if the audio signal level varies to a large extent in a single piece, a phenomenon can be prevented that high-frequency components and low-frequency components are less audible when the sound volume is small. <EOS>