Abstract: A pricking needle device, termed a lancet, used by a patient with diabetes in sampling his/her own blood to measure his/her blood sugar value is provided. The pricking needle device includes a pricking member body and a needle end protective cap. The pricking member body, formed of synthetic resin, carries a pricking needle, the distal end of which is protruded from the end face of the pricking member body. The needle end protective cap, equally formed of synthetic resin, is coupled to the pricking member body, as a protruded distal end of the needle on the pricking member body is admitted into the inside of the needle end protective cap. The pricking needle device includes a position registration unit, a coupling unit, made up of engagement segments, and engagement grooves, and a needle end housing section.