The cartridge body of the cuboid shape with the protective cap (2) which has been detachably attached to one end (1), the puncture opening having its one end (3) needle provided on the rear side (4) The has a slidably retained needle holder toward the puncture opening (3) (5). In addition, it has a sensor portion having a point wear opening at one end (10) of the cartridge body (1) (6). Sensor unit (6) has an aperture was introduced promoted hole (12) on the surface of the cartridge body (1) communicates with the guide grooves (11) communicating with the spotting opening (10). The protective cap (2), a puncture needle protection part that covers the puncture needle (4) and (15), the sensor protecting portion for covering the wearing opening (10) in terms of the sensor unit (6) and (16a), the introduction promoting hole It provides sensor protection section (16b) to cover (12).一端側に脱着自在に装着した保護キャップ(2)を備えた長方体形状のカートリッジ本体(1)が、その一端側に有する穿刺用開口部(3)奥側に設けた穿刺針(4)を穿刺用開口部(3)に向けて摺動自在に保持した穿刺針保持体(5)を有する。さらに、カートリッジ本体(1)の一端側に点着用開口部(10)を有するセンサ部(6)を有する。センサ部(6)は、点着用開口部(10)に連通する導入溝(11)に連通するとともにカートリッジ本体(1)の表面に開口した導入促進孔(12)を有する。保護キャップ(2)には、穿刺針(4)を覆う穿刺針保護部(15)と、センサ部(6)の点着用開口部(10)を覆うセンサ保護部(16a)と、導入促進孔(12)を覆うセンサ保護部(16b)を設ける。
