To provide a guide pin excellent in machinability for bone cement, which allows re-grinding to be performed easily.SOLUTION: A guide pin 1 includes a plurality of groove parts 2 located at a tip 1a, which extend along a central axis S and a surface part 3 located between the groove parts 2 and 2 adjacent to each other out of the plurality of groove parts 2. In a cross sectional view perpendicular to the central axis S, all of the plurality of groove parts 2 project to a central axis S side. In the cross sectional view, all of the plurality of groove parts 2 have curved shapes projecting to the central axis S side.SELECTED DRAWING: Figure 1
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