A gas and liquid separator includes a first separating portion configured to separate a liquid droplet from a first exhaust gas discharged from a negative electrode of a fuel cell, a first container accommodating the first separating portion, a first storage reservoir storing water flowing down from the first separating portion, a second container provided at a lower side of the first storage reservoir, a second storage reservoir provided at a lower portion of the second container, and a valve apparatus including a valve discharging water stored in the first storage reservoir, wherein a second exhaust gas discharged from a positive electrode flows in the second container, and water discharged from the first storage reservoir is stored in the second storage reservoir.