Patent ID: 8915937

Claim:
A puncture needle cartridge comprising: a puncture needle configured to puncture skin; a lancet body configured to cover and protect part or all of a tip of the puncture needle; a cylindrical puncture needle holder disposed on an outer circumferential surface of the lancet body so as to enable the lancet body to move in an axial direction of the puncture needle, and having an opening through which the puncture needle is capable of protruding; and a protective cap configured to cover and protect the opening and configured to be separable from the puncture needle holder, wherein the protective cap comprises a base configured to cover the opening when the protective cap is joined to the puncture needle holder, a shaft protruding from the base toward the opening, and arms mounted on the shaft and configured to abut an inner circumferential surface of the opening in the puncture needle holder by spreading in the opening, and space between tips of the arms is larger than an inside diameter of the opening in the puncture needle holder, and is reduced by elastic deformation when the arms are housed in the opening.