A metal-air battery system includes: a metal-air battery including a case and a charge/discharge member arranged in the case and having a cathode, an anode and an electrolyte; a CO2 absorbing member having a CO2 selective absorber selectively absorbing CO2 over O2; an outside air supplying member supplying outside air to the CO2 absorbing member; a purified air supplying member supplying purified air to the cathode, the purified air having undergone absorptive CO2 removal by the CO2 selective absorber; and a recycling mechanism recycling the CO2 selective absorber.
