To provide a blood collection device assembly capable of collecting a small amount of blood while preventing blood leak.SOLUTION: A blood collection device assembly 100 includes: a pipette tip shaped blood collector 10 that has openings at top and bottom, which includes an internal space that sucks and holds blood by capillary action; a cylindrical container 20 for housing blood collection device; and a cap piston-shaped sealing lid 30 for sealing the container 20. The cylindrical container 20 has a receiving part at the bottom and a locking part and screw part at the top outside. The sealing lid 30 is provided with a mandrel extending from the inner upper surface and a projection and a screw on the inner side surface.SELECTED DRAWING: Figure 1
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