A carbonated water dispenser

Provided is a carbonic acid water dispenser having a configuration capable of efficiently discharging carbonic acid water by pressurizing it under appropriate pressure. A carbon dioxide dispenser 1 that generates and discharges carbon dioxide by dissolving carbon dioxide in drinking water under pressure, wherein the carbon dioxide supply unit 300 includes a first carbon dioxide supply pipe L2 that supplies carbon dioxide to the generation unit and includes a first on-off valve 312, A second carbon dioxide supply pipe L5 provided in parallel with the first carbon dioxide supply pipe L2, branched from the first carbon dioxide supply pipe L2 on the upstream side of the first on-off valve 312, joined to the first carbon dioxide supply pipe L2 on the downstream side of the first on-off valve 312, And Figure 2