An ultrasonic biopsy needle including: a sheath inserted through a channel of an ultrasonic endoscope； a needle tube which is inserted through the sheath and capable of advancing and retracting inside the sheath； and an operation portion which is connected to a proximal end of the sheath and is provided to advance and retract the needle tube. The sheath includes an extension limiting portion that is positioned more distal than a proximal end of a bending portion of the ultrasonic endoscope when a distal end of the sheath is positioned in a visual field of an optical image capturing mechanism of the ultrasonic endoscope. The extension limiting portion is formed of a metal coil, the ratio of the inner diameter of the channel to the outer diameter of the coil is in a range from 1.0:0.84 to 1.0:0.96, the initial tension of the coil is equal to or greater than 2.0 [N], and extension of the sheath caused by the forward and backward movement of the needle tube is limited.
