A subcutaneous fat measuring unit measures the subcutaneous fat thickness by pressing a predetermined face against the living body surface. A pressing pressure measuring unit measures the pressure applied from the subcutaneous fat measuring unit to the living body surface, and a database holds information on the relationship among the values of a plurality of subcutaneous fat thicknesses in the condition where no pressure is applied to the living body surface, the pressure applied to the living body surface with respect to each of the plurality of subcutaneous fat thicknesses and the subcutaneous fat thickness in a condition where the pressure is applied. A calculating unit calculates the subcutaneous fat thickness in a condition where no pressure is applied to the living body surface, by use of the database based on the subcutaneous fat thickness measured by the subcutaneous fat measuring unit and the pressure applied to the living body surface which pressure is measured by the pressing pressure measuring unit. And a visceral fat calculating unit calculates the amount of visceral fat from the calculated subcutaneous fat thickness.