Patent ID: 8251919

Claim:
A lancet to be detachably attached to a main body portion of a lancet device, the lancet device including a biasing member configured to cause a tip of a puncture needle to protrude in a predetermined puncturing direction, the lancet comprising: a puncture body including a puncture needle and a connection portion which is formed on an end opposite to the puncture needle and is releasably connected to the main body portion of the lancet device; a case portion including a tubular portion which accommodates the puncture body so as to be movable back and forth in the puncturing direction, and an opening formed on an end such that the puncture needle protrudes through the opening; and a first fitting portion formed on the tubular portion of the case portion and being disconnected from the puncture body prior to puncturing use and holding the puncture body within the case portion so as to be immovable back and forth in the puncturing direction after puncturing use when the connection portion of the puncture body is released from the main body portion of the lancet device after puncturing use.