<p>The present invention relates to a gas-liquid contactor that includes a plurality of spray nozzles provided in a CO2 absorber for spraying a CO2 absorbent downward into the CO2 absorber in which flue gas drifts upward and passes, so as to bring flue gas that drifts upward and the CO2 absorbent into contact with each other. The spray nozzle includes a wall-surface dedicated nozzle provided along a wall surface in the CO2 absorber and a liquid dispersion nozzle provided inside of the wall-surface dedicated nozzle in the CO2 absorber.</p>
