Disclosed is a substance capable of promoting the repair of a fractured part in a fracture caused by an external force, fatigue or a disease. Also disclosed is a method for producing the substance. Further disclosed is a product capable of promoting the repair of a fracture, such as a food, a beverage and a feed, which comprises the fracture repair promoter. Specifically disclosed is a fracture repair promoter comprising, as an active ingredient, a fraction containing a milk-derived basic protein. In the promoter, the fraction containing the milk-derived basic protein is produced by contacting milk or a milk-derived raw material with a cation exchange resin to cause the adsorption of the basic protein on the cation exchange resin and eluting a fraction adsorbed on the resin by means of an eluent having a salt concentration of 0.1 to 1.0 M.
