Three cases of osteomalacia caused by intravenous administration of saccharated ferric oxide were reported. Three cases were female with ages of 51, 55 and 61 years old. They received saccharated ferric oxide intravenouslly for anemia, just before having back pain, low back pain and hip joint pain due to osteomalacia. Their serum Ca and P were low and alkalinphosphatase was high. At their undecalcified thin sections of the iliac bone, osteoid surface and osteoid bone volume were increased, and little tetracycline had been taken, so that mineralization had been disturbed.