PROBLEM TO BE SOLVED: To provide a blood drawing tool able to more efficiently perform suction through capillary phenomenon.SOLUTION: At least a capillary sucking tube part 1 formed on the tip of the sucking side of a blood drawing tool is formed from a plastic resin containing 0.5 to 5%, preferably 1 to 2% boron and into transparent or translucent, and raises blood sucking effect by taking advantage of its excellent hydrophilicity.SELECTED DRAWING: Figure 1