To easily and accurately place a bone filling material in a cured state at a bone treatment target, a bone treatment system includes a placement device and a deployment operation device. The placement device includes a shaft having a flow path which enables a bone filling material to be placed on a space of a radius to flow therethrough, and a filling balloon to be filled with the bone filling material via the flow path 38 disposed in a distal end portion of the shaft. The deployment operation device 16 can be inserted into the flow path, and exposes the bone filling material by breaking the filling balloon after being filled with the bone filling material.
