It is an object of the present invention to provide a substituted propanamide derivative or a pharmacologically acceptable salt thereof that is useful as a prophylactic or therapeutic agent for a bone metabolic disease. The present invention relates to a pharmaceutical composition comprising a compound having General Formula (I) or a pharmacologically acceptable salt thereof as an active ingredient: [wherein, R1 represents a C6-C10 aryl group that may be substituted by a group selected from Substituent Group α, for example; R2 represents a C6-C10 aryl group that may be substituted by a group selected from Substituent Group α, for example; and X represents a hydroxyl group or a C1-C6 alkoxy group, for example].