PROBLEM TO BE SOLVED: To provide a bone hemostatic agent which does not inhibit the regeneration of bone tissue and has an excellent immediate effect.SOLUTION: The bone hemostatic composition, composed of a polyalkylene glycol polymer having at least one or more kinds of oxyalkylene units, contains a polymer gel component with a water content of 20 to 80%. Since this bone hemostatic composition agent is composed of the unbridged gel components, it can be easily decomposed in vivo, which can induce bone formation while stopping bleeding.