A method for manufacturing a sulfuric acid solution in which a metal is highly efficiently dissolved with a high anode current density while suppressing a passivation, and an electrolyzer used in this manufacturing method are provided. The method for manufacturing the sulfuric acid solution includes an initial electrolyte supply step of supplying a chloride ion-containing sulfuric acid solution as an initial electrolyte in an electrolyzer (10) inside of which is divided into an anode chamber (21) and a cathode chamber (22) by a diaphragm, and an electrolyte taking out step of supplying a current to the anode (13) and a cathode (14) disposed in the electrolyzer (10) and subsequently taking out a metal dissolved electrolyte in which a metal constituting an anode (13) is dissolved from the anode chamber (21). This configuration ensures inhibiting the metal dissolved in a side of the anode (13) from moving to a side of the cathode (14), and suppressing a formation of a passivation in the anode (13) side. Therefore, a high-quality sulfuric acid solution in which the metal is dissolved is efficiently manufacturable.