PROBLEM TO BE SOLVED: To estimate the distance to a sound source by a single microphone array. SOLUTION: The device for measuring the distance to a sound source includes: a single microphone array having a plurality of microphones; a plurality of frequency region conversion parts; a direct/indirect ratio estimating part; a distance-direct/indirect ratio database storing the relationship between direct/indirect ratios and distances; and a distance determination part. Sound reception signals received by the plurality of microphones are input to the plurality of frequency region conversion parts and the frequency region conversion parts convert the sound reception signals into signals of a frequency region. The direct/indirect ratio estimating part estimates a direct/indirect ratio of the sound reception signals based on the signals of a frequency region output from the plurality of frequency region conversion parts as inputs. The distance determination part estimates an estimated value of the distance to a sound source corresponding to the direct/indirect ratio based on the direct/indirect ratio as an input, by referring to the distance-direct/indirect ratio database. COPYRIGHT: (C)2011,JPO&INPIT