A low-frequency treatment device includes a pad including a through hole and a pad side electrode on a rear surface, a holder disposed on the rear surface side of the pad so as to oppose the pad side electrode, a body including a body side electrode and detachably attached to the holder, and a wiring member configured to electrically connect the body side electrode and the pad side electrode. The wiring member includes a first end portion connected to the body side electrode, a second end portion connected to the pad side electrode, and a conductive portion, disposed such that a portion of the conductive portion extends through a through hole, for conducting electricity between the first end portion and the second end portion.
