The present invention relates to a signal processing device without a mechanical switch for operation. The signal processing device without a mechanical switch for operation according to one embodiment of the present invention includes a detection part； and a power supply part. According to one embodiment of the present invention, the detection part detects an intention to use. According to one embodiment of the present invention, the power supply part supplies the power for driving the signal processing device.전기적 접점들과 피검체 혹은 전도성 부재와의 접촉 여부에 기초하여 공급된 전원에 의해 생체 신호를 신호 처리하는 신호 처리 장치를 제공할 수 있다.
