PROBLEM TO BE SOLVED: To provide a carbon dioxide removing device which can effectively use a limited storage space, and a breathing apparatus including the same. SOLUTION: The carbon dioxide removing device is provided with an absorbent container which contains a carbon dioxide absorbent and has an inlet for introducing air and an outlet for discharging air chemically reacted with the carbon dioxide absorbent. The container is formed in a rectangular tube shape or a hexagonal tube shape. [Selection diagram] Fig. 3【課題】限られた保管スペースを有効に使うことができる二酸化炭素除去装置およびそれを備える呼吸装置を提供する。【解決手段】二酸化炭素除去装置は、二酸化炭素吸収剤を収容し、空気が流入する流入口および二酸化炭素吸収剤と化学反応した空気が流出する流出口を有する吸収剤用容器を備え、吸収剤用容器は四角筒形状又は六角筒形状に形成されている。【選択図】図３
