To make a bone supply material be replaced to complete bone forming quickly, by adding plural kinds of chitin/chitosan with different N-deacetylation degrees to a bone supply material containing animal bone powder.

This bone supply material contains chitin/chitosan and animal bone powder. Chitin/chitosan contains plural kinds with different N-deacetylation degree. Chitin/chitosan with high N-deacetylation degree and that of low M- deacetylation degree are mixed and used. Thereby chitin/chitosan with low N-deacetylation degree is quickly decomposed and absorbed in an organism in the initial stage and the invasion of a new blood vessel most necessary and indispensable for bone forming is generated at the part and osteoblast is generated. As time elapses, the bone supply material or a bone supply film is decomposed and absorbed for a wile by chitin/chitosan with high N-deacetylation degree, and osteoblast is continuously generated to form bone and the bone supply material is substituted by bone to quickly complete bone forming.