Blood obtained (14,220) puncture tool in the puncture in the blood vessel and also to determine easily whether the arterial or venous blood, and allows the manipulation of sterile conditions. Blood type determination unit set (10a) has a blood type determination unit that cover body to be attached syringe set (14) and (12a), is housed in the cover body (12a) and (16a). Blood type determination unit is (16a), the blue output LED light receiving element (27) and the light projecting section (26), indicating a determination result based on the signal obtained from (26) receiving element the red output LED (28) (30 I and a). Cover body (12a), the blood between the lid (60) and (64), a light receiving element (27) light emitting portion (26) body to cover the blood type determination unit and (16a) in combination with each other and a measuring window of the pair to transmit light between the light receiving element (27) light emitting portion (26) through the partition portion for passing (72), the partition part (72) and (82, 84).血管に穿刺をして穿刺具(14、220)に得られた血液が静脈血か動脈血かを簡便に判断するとともに、滅菌状態の操作を可能にする。血液種別判定器セット(10a)は、シリンジセット(14)に装着されるカバー体(12a)と、カバー体(12a)に収納される血液種別判定器(16a)とを有する。血液種別判定器(16a)は、投光部(27)及び受光素子(26)と、受光素子(26)から得られる信号に基づく判断結果を示す青出力LED(28)及び赤出力LED(30)とを備える。カバー体(12a)は、互いに組み合わされて血液種別判定器(16a)を覆う本体(60)及び蓋体(64)と、投光部(27)と受光素子(26)との間で血液を通過させる仕切部(72)と、仕切部(72)を介して投光部(27)と受光素子(26)との間で光を透過させる一対の計測窓(82、84)とを有する。
