By taking such measures that in the brain wave measurement by a wearable device capable of an acoustic output and in a brain wave interface or in a brain wave monitor, noise derived from an output acoustic signal is estimated and removed from the voltage level obtained at an electrode, brain waves can be used without being affected by the noise. A brain wave measuring device comprises: a brain wave measuring unit for measuring the brain waves of the user by using a plurality of electrodes; an electroacoustic converter disposed in the vicinity of at least one electrode among the plurality of electrodes when the user wears the brain wave measuring unit and presenting an acoustic signal to the user; an amplitude envelope extraction unit for extracting the amplitude envelope of the acoustic signal presented from the electroacoustic converter; a frequency analysis unit for analyzing the frequency of the amplitude envelope extracted by the amplitude envelope extraction unit; and a noise estimation unit for estimating electric noise mixed in at least one electrode by using a previously prepared conversion rule and the extracted amplitude envelope.
BRAIN WAVE MEASURING DEVICE, ELECTRIC NOISE ESTIMATION METHOD, AND COMPUTER PROGRAM FOR EXECUTING ELECTRIC NOISE ESTIMATION METHOD