The present invention is provided with: a low-frequency pulse generating circuit 4； a high-frequency signal generating circuit 5； a synthesizing section 7, formed by superimposing the high-frequency signal wave generated in the high-frequency signal generating circuit on the low-frequency pulse signal wave generated in the low-frequency pulse generating circuit The composite wave； the waveform control signal circuit 6 controls the composition section to constitute a cycle such that the on period of the high frequency signal wave overlaps the low frequency pulse signal wave and the high frequency signal wave does not overlap the off period of the low frequency pulse signal wave The composite wave； and the output transformer, the input composite wave； when a pair of pads connected to the output side of the output transformer is installed in a living body, the voltage of the composite wave gradually during the conduction period of the composite wave in the output side of the output transformer Increase and decrease the way to set the impedance of the output side of the output transformer.本發明具備：低頻脈衝產生電路4；高頻信號產生電路5；合成部7，形成由高頻信號產生電路中產生之高頻信號波重疊於低頻脈衝產生電路中產生之低頻脈衝信號波而成的合成波；波形控制信號電路6，以使高頻信號波重疊於低頻脈衝信號波之導通期間與高頻信號波未重疊於低頻脈衝信號波之斷開期間為一個循環的方式控制合成部構成合成波；以及輸出變壓器，輸入合成波；當將連接於輸出變壓器的輸出側之一對以上的墊安裝到活體時，以在輸出變壓器的輸出側中之合成波之導通期間合成波的電壓逐漸增加以及減少的方式，來設定輸出變壓器的輸出側的阻抗。
