Provided is an oxygen absorber comprising gallic acid and transition metal compound, and the oxygen absorbers may further comprise carbonic acid alkali compound. The oxygen absorbers have an excellent safety, and an equivalent ability of oxygen absorbency to the oxygen absorbers comprising iron powder.本發明是提供一種氧吸收劑,其含有沒食子酸與過渡金屬化合物,也可以含有碳酸系鹼化合物,該氧吸收性劑為安全性優良,具有與含有鐵粉之氧吸收劑為相同之氧吸收性能。