A puncture needle cartridge that is attached to a puncture instrument , comprising: a columnar lancet body having a puncture needle , a first end and a second end; a connector that is connected to the puncture instrument on a side of the second end, which is an opposite side from the first end at which puncture is performed with the puncture needle ; a puncture needle cover that is provided on a side of the first end and covers a tip portion of the puncture needle before use; a breakable component that is provided to a middle section between the first end and the second end, is broken when performing puncturing, and separates the puncture needle cover and exposes the tip portion of the puncture needle ; guide protrusions that are provided to the outer peripheral face of the puncture needle cover on the side of the first end of the breakable component ; and sliding protrusions that are provided closer to the side of the second end than the breakable component ; and a tubular lancet case having spiral guide components formed from the side of the first end toward the side of the second end, configured to impart a rotational force in a specific direction when there is relative movement in a puncture direction in a state in which the guide protrusions are engaged; and a sliding groove configured to guide movement in the puncture direction in a state in which the sliding protrusions are engaged, the lancet case being mounted to an outer periphery of the middle section of the lancet body in a state in which the breakable component has not been broken, the puncture needle cover further has stoppers configured to restrict sliding to the side of the second end from a state in which the lancet case is mounted to the middle section. a columnar lancet body having a puncture needle , a first end and a second end; a connector that is connected to the puncture instrument on a side of the second end, which is an opposite side from the first end at which puncture is performed with the puncture needle ; a puncture needle cover that is provided on a side of the first end and covers a tip portion of the puncture needle before use; a breakable component that is provided to a middle section between the first end and the second end, is broken when performing puncturing, and separates the puncture needle cover and exposes the tip portion of the puncture needle ; guide protrusions that are provided to the outer peripheral face of the puncture needle cover on the side of the first end of the breakable component ; and sliding protrusions that are provided closer to the side of the second end than the breakable component ; and a tubular lancet case having spiral guide components formed from the side of the first end toward the side of the second end, configured to impart a rotational force in a specific direction when there is relative movement in a puncture direction in a state in which the guide protrusions are engaged; and a sliding groove configured to guide movement in the puncture direction in a state in which the sliding protrusions are engaged, the lancet case being mounted to an outer periphery of the middle section of the lancet body in a state in which the breakable component has not been broken, the puncture needle cover further has stoppers configured to restrict sliding to the side of the second end from a state in which the lancet case is mounted to the middle section. <EOS>