It is intended to provide an osteogenesis promoter capable of promoting osteogenesis by promoting the differentiation of osteoblasts, and foods, drinks, drugs or feeds for promoting osteogenesis. Namely, an osteogenesis promoter capable of promoting osteogenesis by promoting the differentiation of osteoblasts which comprises, as the active ingredient, lactoperoxidase and/or a digestion product obtained by digesting lactoperoxidase with a protease such as trypsin; and foods, drinks, drugs or feeds for promoting osteogenesis containing lactoperoxidase and/or its digestion product.