PROBLEM TO BE SOLVED: To obtain a psychologically stable state in a pregnant woman and to contribute to character shaping in an embryo by modulating a brain wave signal of a frequency which is generated in the most stable and relaxed state in mind and body among human brain waves into an audible frequency audio signal, permitting it to be a brain wave sound, mixing the sound with an embryo sound and outputting it. SOLUTION: An antenatal training device is provided with a brain wave sound generating device 30 for artificially generating the brain wave signal of the frequency generated in the most stable and relaxed state in mind and body among the human brain waves, that is, the frequency corresponding to -wave, modulating the brain wave signal into the audible frequency audio signal which can be heard by a person and outputting it as the brain wave sound. The device 30 is constituted of a first brain wave generating part 31 for generating -wave and the second brain wave generating part 32 or the like for maximizing an effect by brain wave synchronization. Besides, the antenatal training device is also provided with an embryo sound collecting device 40 by which the sound of heart beats in the embryo and the sound obtained when the embryo moves are collected and they are outputted as the embryo sound. Then the pregnant woman or the like hears the sound consisting of the mixture of the brain wave sound and the embryo sound by a stereo amplifier part 38.
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