PURPOSE: To prevent that a user is apt to scatter his/her attention and that the effect of a self-control training is reduced because of the swaying of a cord while the title electroacoustic transducer is used when the user uses the electroacoustic transducer for the self-control training, etc., by equipping the transducer with an electrode for picking an electric signal mainly composed of a brain wave in one body with a speaker part.

CONSTITUTION: A speaker part 1, an electrode 2 for picking the electric signal mainly composed of the brain wave, and an earth 1a are integrated into one body and respectively connected with a cassette tape recorder body and a biofeedback device body with pin jacks 4a and 4b provided for a connecting cord 3. Since the electroacoustic transducer part and an electrode part are integrated, and wiring is simplified, the electroacoustic transducer can be fitted to a user's body extremely easily, further the wiring never disturbs the user, and the self- control training can be executed extremely smoothly.