PROBLEM TO BE SOLVED: To provide a cap which is capable of easily and surely performing piercing by a hollow needle, hardly causing the hollow needle to fall off due to repulsive force of a sheath, easily and surely sampling a body fluid and being attached and detached to/from a body fluid sampling container when sampling the body fluid such as blood.SOLUTION: The cap 1 for airtightly sealing the opening end of the body fluid sampling container 14 inserted to a cylindrical holder 11 includes a cylindrical cap body 2, an annular elastic ring 3, a sealing film 4 and a piercing member 5 made of an elastic material. The sealing film 4 is fixed to the lower surface of an annular support part 2c provided on the intermediate height position of the cap body 2 so as to airtightly seal an opening 2e, the elastic ring 3 is fixed to the lower surface of the sealing film 4, the piercing member 5 is fixed to the upper surface of the sealing film 4, and the cap 1 is externally inserted and fixed to the body fluid sampling container from the side of the opening 2d on the lower end of the cap body 2.COPYRIGHT: (C)2011,JPO&INPIT【課題】血液などの体液を採取するに際し、中空針による刺通を容易にかつ確実に行うことができ、鞘の弾発力による中空針の抜けが生じ難く、容易にかつ確実に体液を採取でき、しかも体液採取用容器から脱着可能なキャップを提供する。【解決手段】筒状のホルダー11に挿入される体液採取用容器14の開口端を気密封止するためのキャップ1であって、筒状のキャップ本体2と、環状の弾性リング3と、封止フィルム4と、弾性材料からなる刺通部材5とを備え、キャップ本体2の中間高さ位置に設けられた環状支持部2cの下面に封止フィルム4が開口2eを気密封止するように固定されており、封止フィルム4の下面に弾性リング3が固定されており、封止フィルム4の上面に刺通部材5が固定されており、キャップ本体2の下端の開口2d側から体液採取用容器に外挿されて固定される、キャップ1。【選択図】図3
