To provide a body fluid treater which facilitates the removal of the residual moisture or the like in a gap between a male nozzle and an outer cylindrical section with a female screw of a lure lock type nozzle, and enables the simplification of a production process.

The typical structure of the body fluid treater of this invention is the body fluid treater which is equipped with the lure lock type nozzle 1 which has the male nozzle 2 to receive or to discharge the body fluid and the outer cylindrical section with the female screw 4 formed outside of the male nozzle 2 and has at least one penetration hole 17 at the side face of the outer cylindrical section with the female screw 4.