Provided are an alloy member usable for a living body and a manufacturing method thereof, which can realize a necessary biodegradable life while taking advantage of characteristics of biocompatibility and biodegradability of magnesium. The alloy member usable for a living body of the present invention comprises a substrate containing a magnesium alloy and a first protective layer containing a complex of an oxide or an oxide and a hydroxide derived from a component of the substrate, And a second protective layer containing a hydroxide derived from the component of the first component.マグネシウムの生体親和性と生分解性の特徴を生かしつつ、必要な生分解性寿命を実現できる生体に使用可能な合金製部材およびその製造方法を、提供する。本発明の生体に使用可能な合金製部材は、マグネシウム合金を含む基体と、前記基体の成分を由来とする酸化物もしくは酸化物および水酸化物の複合体を含む第1保護層と、前記基体の成分を由来とする水酸化物を含む第2保護層と、を備える。
