PROBLEM TO BE SOLVED: To provide a bone screw and an implant plate that enable the bone screw to be screwed into the implant plate and bone from various directions without causing scraps.SOLUTION: A bone screw 2a comprises a shaft 7 having a bone thread 8, and a screw head 9 at one end of the shaft. A groove-shaped depression 11 extending in the circumferential direction is formed in the screw head at a face on the shaft side of the screw head. The groove-shaped depression has a groove flank provided for clamping, bracing or locking to an implant plate 1.
