INDUSTRIAL APPLICABILITY The present invention makes it possible to further enhance the therapeutic effect of a sheet material for medical use used for treatment of organisms such as stiffness, pain and cuts of human muscles. According to the present invention, there is provided an AC power supply comprising: an AC power supply having one output terminal grounded and an LC parallel circuit serially connected to the other ungrounded side output terminal of the AC power supply, A power supply device for outputting a superposed wave vo of an output voltage v of the AC power supply and an induced electromotive force v induced to the LC parallel circuit by an external electromagnetic wave a power supply device connected to the output terminal of the power supply device via a lead wire Infrared radiator layer having a far infrared ray emitting layer formed thereon, the medical sheet material is disposed directly or with a gap on the far infrared radiator layer of the conductor electrode plate, and the output of the power supply device The superposed wave vo is outputted from the terminal to the conductor electrode plate to generate a varying electric field in the conductor electrode plate so that the entire medical sheet material is located in the variable electric field to activate the entire medical sheet material .本発明は、生物、例えば人間の筋肉の凝りや痛み、切り傷等の治療に使用する医療用用シート材の治療効果をより高めることを可能にする。 本発明は、一方の出力端子を接地した交流電源と、当該交流電源の他方の非接地側出力端子に直列に接続したLC並列回路とからなり、当該LC並列回路の他端を出力端子として、前記交流電源の出力電圧vと外部電磁波により前記LC並列回路に誘導された誘導起電力v’との重畳波voを出力する電源装置と、当該電源装置の前記出力端子にリード線を介して接続した遠赤外線放射層を有する導電体製電極板とを用い、前記導電体製電極板の遠赤外線放射体層の上部に直接又は間隙を置いて医療用シート材を配置して、電源装置の出力端子から導電体製電極板へ前記重畳波voを出力することにより導電体製電極板に変動電場を生じさせ、医療用シート材の全体を変動電場内に位置させて医療用シート材全体を活性化させる。