A carbon dioxide capturing system comprising: an absorber configured to bring a gas containing carbon dioxide into contact with an absorption liquid capable of absorbing the carbon dioxide, and to discharge the absorption liquid having absorbed the carbon dioxide; a regenerator configured to cause the absorption liquid discharged from the absorber to release the carbon dioxide, and to discharge the absorption liquid having released the carbon dioxide; a first absorption liquid line configured to introduce the absorption liquid discharged from the absorber to the regenerator; a second absorption liquid line (12, 13) configured to introduce the absorption liquid discharged from the regenerator to the absorber; a heat exchanger configured to exchange heat between the absorption liquid flowing in the first absorption liquid line and the absorption liquid flowing in the second absorption liquid line; a bypass line configured to branch from the first absorption liquid line between the absorber and the heat exchanger, and to introduce the absorption liquid to the regenerator without passing through the heat exchanger; and a controller; wherein, the carbon dioxide capturing system further comprises either: 1) a plurality of absorption liquid valves provided on the bypass line; a plurality of measuring instruments configured to measure a temperature that indicates a state of the regenerator, each measuring instrument being near a specific absorption liquid valve; wherein the controller is configured to increase a degree of opening of the specific absorption liquid valve when the temperature measured by the measuring instrument near the specific absorption liquid valve increases, thereby cooling the absorption liquid near the measuring instrument in the regenerator; or 2) an absorption liquid valve provided on the bypass line; a measuring instrument configured to measure a temperature that indicates a state of the regenerator; wherein the controller increases a degree of opening of the absorption liquid valve when the temperature measured by the measuring instrument increases, thereby cooling the absorption liquid in the regenerator. an absorber configured to bring a gas containing carbon dioxide into contact with an absorption liquid capable of absorbing the carbon dioxide, and to discharge the absorption liquid having absorbed the carbon dioxide; a regenerator configured to cause the absorption liquid discharged from the absorber to release the carbon dioxide, and to discharge the absorption liquid having released the carbon dioxide; a first absorption liquid line configured to introduce the absorption liquid discharged from the absorber to the regenerator; a second absorption liquid line (12, 13) configured to introduce the absorption liquid discharged from the regenerator to the absorber; a heat exchanger configured to exchange heat between the absorption liquid flowing in the first absorption liquid line and the absorption liquid flowing in the second absorption liquid line; a bypass line configured to branch from the first absorption liquid line between the absorber and the heat exchanger, and to introduce the absorption liquid to the regenerator without passing through the heat exchanger; and a controller; 1) a plurality of absorption liquid valves provided on the bypass line; a plurality of measuring instruments configured to measure a temperature that indicates a state of the regenerator, each measuring instrument being near a specific absorption liquid valve; wherein the controller is configured to increase a degree of opening of the specific absorption liquid valve when the temperature measured by the measuring instrument near the specific absorption liquid valve increases, thereby cooling the absorption liquid near the measuring instrument in the regenerator; or 2) an absorption liquid valve provided on the bypass line; a measuring instrument configured to measure a temperature that indicates a state of the regenerator; wherein the controller increases a degree of opening of the absorption liquid valve when the temperature measured by the measuring instrument increases, thereby cooling the absorption liquid in the regenerator.