To provide a corset bone capable of following the body form of the corset-wearing person even if the person is tilted forward or bent forward and increasing the abdominal pressure over the whole waist by applying proper tightened feeling and provide a corset furnished with the bone.

This corset bone 10 is attached to a corset main body in a manner to be positioned to a prescribed part of the back of the wearing person. The bone keeps rigidity to the load to the back and allows the forward bending of the body. The bone contains plural bone pieces 12, 13, 14 divided along the longitudinal direction and connected with each other by bonding means. The bonding means is a hinge 20 to form the connecting part of the bone pieces 12, 13, 14, follows the change of body form of a wearing person even in the case of bending the person forward and increases the abdominal pressure around the waist by the application of a proper tightened feeling to the wearing person.