Abstract
A typical biofeedback device consists of sensor(s), signal amplifier, signal processor, memory unit, communication unit, display, and power supply. Each element should be suitably chosen or adjusted for a specified application. Biofeedback devices are used not only in psychosomatic medicine but also in daily life, such as stress management and mental health promotion. In the paper, biofeedback devices now available in Japan were shown and briefly discussed. In Japan the market scale of biofeedback device has been small, partly because of strict legal regulations on medical equipments and materials.
