A reclaiming device configured to separate an absorption liquid from a coexisting material other than an absorbent, the absorption liquid being cyclically used in order to absorb and remove an acidic gas from a treatment target gas by being brought into gas-liquid contact with the treatment target gas, comprising: a gas-liquid separator configured to accept introduction of the absorption liquid to be reclaimed together with water and to separate the absorption liquid into a non-volatile material and a vaporized material; a first discharged liquid line configured to introduce a first discharged liquid discharged from the gas-liquid separator into the gas-liquid separator at a position below an absorption liquid introduction port through which the absorption liquid is introduced into the gas-liquid separator; a first heater disposed on the first discharged liquid line and configured to heat the first discharged liquid; a second discharged liquid line (55a, 55a', 55a") configured to introduce a second discharged liquid discharged from the gas-liquid separator into the gas-liquid separator at a position below a first discharged liquid introduction port through which the first discharged liquid is introduced into the gas-liquid separator; and a mixing tank disposed on the second discharged liquid line (55a, 55a', 55a") and configured to mix the second discharged liquid with an alkaline agent, the reclaiming device further comprising: a solid-liquid separator disposed on the second discharged liquid line (55a, 55a', 55a") and configured to subject a mixture mixed in the mixing tank to solid-liquid separation, and a mixed liquid circulating line configured to introduce part of the mixed liquid separated by the solid-liquid separator into the mixing tank, wherein a mixed liquid separated by the solid-liquid separator is introduced into the gas-liquid separator through the second discharged liquid line (55a, 55a', 55a"). a gas-liquid separator configured to accept introduction of the absorption liquid to be reclaimed together with water and to separate the absorption liquid into a non-volatile material and a vaporized material; a first discharged liquid line configured to introduce a first discharged liquid discharged from the gas-liquid separator into the gas-liquid separator at a position below an absorption liquid introduction port through which the absorption liquid is introduced into the gas-liquid separator; a first heater disposed on the first discharged liquid line and configured to heat the first discharged liquid; a second discharged liquid line (55a, 55a', 55a") configured to introduce a second discharged liquid discharged from the gas-liquid separator into the gas-liquid separator at a position below a first discharged liquid introduction port through which the first discharged liquid is introduced into the gas-liquid separator; and a mixing tank disposed on the second discharged liquid line (55a, 55a', 55a") and configured to mix the second discharged liquid with an alkaline agent, the reclaiming device further comprising: a solid-liquid separator disposed on the second discharged liquid line (55a, 55a', 55a") and configured to subject a mixture mixed in the mixing tank to solid-liquid separation, and a mixed liquid circulating line configured to introduce part of the mixed liquid separated by the solid-liquid separator into the mixing tank, wherein a mixed liquid separated by the solid-liquid separator is introduced into the gas-liquid separator through the second discharged liquid line (55a, 55a', 55a"). a solid-liquid separator disposed on the second discharged liquid line (55a, 55a', 55a") and configured to subject a mixture mixed in the mixing tank to solid-liquid separation, and a mixed liquid circulating line configured to introduce part of the mixed liquid separated by the solid-liquid separator into the mixing tank, wherein a mixed liquid separated by the solid-liquid separator is introduced into the gas-liquid separator through the second discharged liquid line (55a, 55a', 55a").