A manufacturing method is a method of manufacturing a composite material molded article containing acicular hydroxyapatite. This manufacturing method comprises: a preparation step of mixing at least a calcium phosphate compound including α-tricalcium phosphate, a calcium compound containing no phosphorus, cellulose nanofibers, and an aqueous solvent consisting of water and/or a hydrophilic solvent to obtain a mixture； a molding step of forming a molded article by using the mixture； a drying step of drying the molded article； and a synthesis step of performing synthesis treatment of the molded article after drying.
