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Humans are subjected to large amounts of stress during daily life. Mental health and stress management in daily life are essential to prevent mental illness. We investigate whether or not mental stress shows recognizable displacements of measurable physiological signals. We have therefore been developing new physiological signal sensors for measurement of daily stress. The present study focused on Â¿body-soundÂ¿, as the sounds generated inside the human body and included large amounts of information about physiological and mental conditions. We then developed a prototype of body-sound sensor, and measured heart rate and respiratory rate simultaneously from body-sound at the neck using continuous wavelet transformation. Finally, we compared the body-sound with electrocardiogram and respiratory waveform to evaluate the performance of proposed method.