The measurement signal generation unit 211 includes a D/A converter, an amplifier, and the like and generates a measurement signal for measuring ear canal transfer characteristics. The measurement signal is, for example, an impulse signal, a TSP (Time Stretched Pulse) signal, or the like. In the present embodiment, the measurement device 200 performs impulse response measurement by using impulse sounds as the measurement signal.

Each of the left microphone 2L and the right microphone 2R of the microphone unit 2 picks up the measurement signal, and outputs a sound pickup signal to the processing device 201. The sound pickup signal acquisition unit 212 acquires the sound pickup signals picked up by the left microphone 2L and the right microphone 2R. Note that the sound pickup signal acquisition unit 212 may include an A/D converter that A/D converts the sound pickup signals from the microphones 2L and 2R. The sound pickup signal acquisition unit 212 may perform synchronous addition of signals acquired by a plurality of times of measurement. A sound pickup signal in the time domain is referred to as an ECTF.