ONO-5920/YM529 Confirmatory Study in Involutional Osteoporosis Patients

Inclusion Criteria: * Patients whose bone mineral density is \<70% of Young Adult Mean (YAM), or \<80% of YAM who have fragile fracture history * Patients can walk on his/her own * Written informed consent has been obtained from the patient. Exclusion Criteria: * Sequential osteoporosis patients or patients with other disorders showing low bone mass * Patients with the findings that influence measurement of lumbar vertebral bone mineral density by the DXA method * Patients who are unable to keep raising or standing for ≥30 min * Patients with peptic ulcer * Patients who have experienced anamnesis or gastrectomy (total extraction)