Movement of blood by capillary action can be readily and easily conducted the collection of blood for testing as well as collecting the [challenge] the initial flow of blood, it is possible to reduce the blood collection time. To provide blood collections first flow removal and blood collection sets first flow removal bag. Third partition portion and (P2) (P1), the second partition portion of the first partition portion of a plurality of (P3), a blood pool (S1), the air reservoir (S2, [MEANS FOR SOLVING PROBLEMS] The bag body (21) internal blood pool space is divided into a) is formed between the second partition portion bag body (21) and (P2), the side wall bag body (21) and (SD) (S) is, ( The one aspect of the preferred embodiment bled first stream removal bag which functions as a passage deflation of air introduced the air reservoir and the blood inflow path, the blood introduced into S1) to (S2) and (B) provided as Tsu. [Selection] Figure Figure 1【課題】初流血液を採取するとともに検査用血液の採取を容易に行い、かつ毛管現象による血液の移動が容易にでき、採血時間を短縮できる。採血初流除去バッグ及び採血初流除去セットを提供する。【解決手段】バッグ本体(21)内部を、複数の第1仕切部(P1)、第2仕切部(P2)及び第3仕切部(P3)により、血液溜(S1)と、空気溜(S2)とに区画し、バッグ本体(21)内の第2仕切部(P2)と、バッグ本体(21)の側部壁面(SD)との間に形成される空間(S)が、血液溜(S1)に導入される血液の血液流入経路、及び前記空気溜(S2)に導入される空気の空気抜け流路としての機能を有する採血初流除去バッグ(B)をその好ましい実施の態様の一つとして提供する。【選択図】図1
