Ultrasonically guided puncturing needle that constitutes the inner needle of the indwelling needle (12) (10) has a (22) uneven portion for reflecting the ultrasonic waves. Concavo-convex portion (22) includes a groove (24) provided on the outer peripheral surface near the tip portion having a (11) C plane, ridges provided on both sides of the groove (24) and (26).留置針(12)の内針を構成する超音波ガイド穿刺針(10)は、超音波を反射させる凹凸部(22)を有する。凹凸部(22)は、刃面(11)を有する先端部の近傍の外周面に設けられた溝部(24)と、溝部(24)の両側に設けられた隆起部(26)とを備える。
