A disposable lancing device (10) including: a housing (16) a spring member (74) a lancet (18) having a skin puncture needle (62), the spring member (74) and the lancet (18) being housed within the housing (16) such that a needle tip (69) of the skin puncture needle (62) is adapted to be projected out from the housing (16) under urging of the lancet (18) by the spring member (74) to perform skin puncture procedure and a protective cap (20) having a needle passage hole (87) and covering the needle tip (69) of the skin puncture needle (62), the protective cap (20) being adapted to separate from the skin puncture needle (62) and rotate so that the needle passage hole (87) of the protective cap (20) is positioned on a path of projection of the skin puncture needle (62), and the skin puncture procedure is performed with the protective cap (20) supported on the housing (16).
