A washing machine with an electrolyzer is provided to swiftly correspond to the change of water flow and to safely maintain the adequate concentration of a metallic ion. A washing machine with an electrolyzer comprises: an electrolyzer(1) adding electrolysis product to water supplied from a feed water unit; an electricity detecting element(4) for detecting electric conductivity of water supplied with the electrolyzer; a flow rate detecting element(5) for detecting quantity of flow supplied with the electrolyzer; and a controlling unit(7) for controlling the duty rate of ON/OFF on the basis of the minimal voltage applying time of the electrolyzer.
