Puncture instrument, puncture needle cartridge mounted in puncture instrument, and method for using puncture instrument and puncture needle cartridge

A puncture needle cartridge having a lancet main body with a first end side from which a puncture needle is stuck out, and a second end side of the lancet main body opposite the first end side of the lancet main body, the puncture needle cartridge comprising:

• the lancet main body having a breakaway part in a middle thereof;
• a puncture needle embedded in the lancet main body across the breakaway part of the lancet main body;
• a puncture needle cover provided on the first end side of the lancet main body;
• a connector for the puncture instrument, provided on the second end side of the lancet main body;
• a lancet case mounted to an outer periphery of the lancet main body;
• a guide protrusion that sticks out from the puncture needle cover;
• a guide component formed extending from a first end side of the lancet case toward a second end side of the lancet case, the guide component configured to guide the guide protrusion so that the lancet case receives a turning force;
• a slide protrusion formed nearer to the second end side of the lancet main body than the breakaway part of the lancet main body, the slide protrusion protruding outward from the lancet main body;
• and
• a slide groove formed in the lancet case and configured to guide the slide protrusion.