The utility model provides a remaining needle component which enables medical personnel to pull out and extract an inner needle from an outer needle base without the false understanding of bleeding. An inner needle with a sharp pinpoint is arranged at the tip end part of the remaining needle component; the inner needle is inserted into the interior of an outer needle which is provided with the outer needle base; the inner hole of the outer needle base is provided with and hemostatic rubber; the hemostatic rubber seals the liquid space and the accommodation space under the condition that the inner needle penetrates; the hemostatic rubber can block a penetrating hole under the action of elasticity in case the inner needle is pulled out; an opaque locking part is inserted into the position, closer to the insertion hole of the base than the hemostatic rubber, in the inner hole of the main body part of the outer needle base. Therefore, the outer needle base adopts the structure that a person can see the liquid space and can not see the accommodation space from the exterior of the outer needle base.