Needle tube (3) is a needle tube which is applied to the biopsy needle (3), the body portion of the tubular (31), the front end opening portion formed at the distal end (31a) of the main body (31) and (32) , when a force living tissue enters the distal end opening portion (32) moves toward the distal opening (32) is applied, the opening of the distal end opening so that a portion of the living tissue engaging (32) end (33) to the side which is formed on the proximal side of the distal end opening portion of the inner peripheral surface of the main body portion has a locking surface that is directed to the opposite side (38) (31) (32) position and a hole (36).針管(3)は、生検針に適用される針管(3)であって、管状の本体部(31)と、本体部(31)の先端(31a)に形成された先端開口部(32)と、先端開口部(32)から入り込んだ生体組織が先端開口部(32)に向かって移動する力が作用したときに、生体組織の一部が係止するように先端開口部(32)の開口端(33)側とは反対側へ向けられた係止面(38)を有し本体部(31)の内周面のうち先端開口部(32)の基端側の位置に形成された側孔(36)とを有する。
