The object of the present invention is to provide a therapeutic agent or a prophylactic agent for a disease resulting from an abnormal bone metabolism, especially osteoporosis which is more effective than conventional agents. Excellent therapeutic effect or prophylactic effect on a disease resulting from an abnormal bone metabolism, especially osteoporosis, compared with the effect in administration of each compound alone can be obtained by the combination of an N-hydroxybenzamidine derivative represented by Formula (I) or a salt thereof with an activated vitamin D or a prodrug thereof.
