An electrolytic bath for manufacturing acid water capable of securing sufficient conductivity even in pure water or deionized water without separately using a catalyst or an ion exchange resin, electrolyzing the pure water or deionized water as well as tap water, and particularly minimizing a reaction between ions and a gas through a deaeration effect and an electrolytic effect in one electrolytic process, increasing conductivity of acid water, and enhancing reduction potential and maintenance time of dissolving power, to obtain acid water (hydrogen water) as stable acid reduced water.