A discharging device includes a liquid container configured to contain a liquid, a discharge channel configured to discharge a fluid from the liquid container, a float member which is lower in specific gravity than the liquid, is movably arranged in the discharge channel, and move up together with the liquid to come into contact with a float sealing member arranged in the discharge channel, thereby shutting the discharge channel, separating means configured to separate the float member from the float sealing member, suction means configured to discharge the fluid from the liquid container via the discharge channel, and control means configured to operate the separating means when operating the suction means.