It is twisted the suffering body (200) vis-a-vis the bone section and the ultra wave which relates to the being twisted vibration which the ultrasonic oscillation section (110) from oscillates, the suffering body (200) the bone section is spread, the suffering body (200) through, the ultrasonic sensing station (120) with it detects the ultra wave which gives the vibration, particular ultrasonic damping coefficient (it calculates attenuation factor) and speed of sound on the basis of the ultra wave which relates to the being twisted vibration which is detected particularly CPU (150) in, on the basis of damping coefficient and the speed of sound which were calculated the suffering body (200) the bone in the bone section it is rough advance of the pore symptomThe quality which displays circumstance (bone age) try to calculate. Because of this, there are no times when great load is applied on the body of the subject, the bone are rough progress of the pore symptom quantitatively, at the same time, try to be able measure properly.被験体(200)の骨部に対して捩れ振動を与える超音波を超音波発振部(110)から発振し、被験体(200)の骨部を伝播した捩れ振動に係る超音波を、被験体(200)を介して超音波検出部(120)で検出し、CPU(150)において、当該検出された捩れ振動に係る超音波に基づいて当該超音波の減衰係数(減衰率)及び音速を算出し、算出した減衰係数及び音速に基づいて被験体(200)の骨部における骨粗鬆症の進行状況を表す特性(骨年齢)を算出するようにする。これにより、被験者の身体に多大な負荷をかけること無く、骨粗鬆症の進行状況を定量的に、且つ、適正に計測することができるようにする。
