[Problem] To easily and accurately place a bone filling material in a cured state on a bone treatment target. [Means for Resolution] A bone treatment system 10 includes a placement device 14 and a deployment operation device 16. The placement device 14 includes a shaft 30 having a flow path 38 which enables a bone filling material to be placed on a space 108 of a radius 100 to flow therethrough, and a filling balloon 32 to be filled with the bone filling material via the flow path 38 disposed in a distal end portion of the shaft 30. The deployment operation device 16 can be inserted into the flow path 38, and exposes the bone filling material by breaking the filling balloon 32 after being filled with the bone filling material.
