Polyaxial bone screw

[Subject] Offer a multi-axis bone screw assembly object maintainable to direction of a request of a rod receptacle part before fixing an axial part to a rod receptacle part. [Solution means] The axial part 212 which is the multi-axis fixed equipment 210 and has the spherical head 216 at a proximal end, The receptacle part 218 which has the opening 237 which makes it pass in the direction of an axis, and carried the spherical head 216 of the axial part 212 in many axes, Before producing friction sufficient between the spherical head 216 and the receptacle part 218 and fixing the spherical head 216 in the receptacle part 218, it has the composition possessing the engaging-of-clutch component 224 maintainable to direction of a request of the axial part 212. [Selection figure] Fig. 2A