This invention relates to a biodegradable implant including magnesium, wherein the magnesium contains, as impurities, manganese (Mn); and one selected from the group consisting of iron (Fe), nickel (Ni) and mixtures of iron (Fe) and nickel (Ni), wherein an amount of the impurities is 1 part by weight or less but exceeding 0 parts by weight based on 100 parts by weight of the magnesium and weight ratio of the impurities satisfies the following condition: 0<;ManganeseMnOne selected from the group consisting of ironFe,nickelNiand mixtures of ironFeand nickelNi≤5, and to a method of manufacturing the same.