The present ultrasonic biopsy needle includes a sheath inserted through a channel of an ultrasonic endoscope, a needle tube inserted so as to be capable of advancing and retracting to and from the sheath, a needle tube connected to a proximal end of the sheath, Wherein the sheath is configured such that in a state in which the distal end of the sheath is located within the field of view of the optical imaging mechanism of the ultrasonic endoscope, , The meandering suppressing portion is made of a metallic coil and the ratio of the outer diameter of the coil to the inner diameter of the channel is from 1.0: 0.66 to 1.0: 0 .84, and the initial tension of the coil is 5.0 [N] or more.本超音波生検針は、超音波内視鏡のチャンネルに挿通されるシースと、前記シースに進退可能に挿通される針管と、前記シースの基端に接続され、前記針管を進退操作するための操作部と、を備え、前記シースは、前記シースの先端が前記超音波内視鏡の光学撮像機構の視野内に位置する状態において、前記超音波内視鏡の湾曲部基端よりも基端側に位置する蛇行抑制部を有し、前記蛇行抑制部は、金属製のコイルからなり、前記チャンネルの内径に対する前記コイルの外径の比が1.0:0.66から1.0:0.84の範囲内にあり、前記コイルの初張力が5.0[N]以上である。
