PROBLEM TO BE SOLVED: To provide a guide member capable of suppressing damage to a needle tip of a puncture needle when inserting the puncture needle into a guide hole portion. A guide member is attached to an ultrasonic diagnostic apparatus, and includes a main body portion attached to the ultrasonic diagnostic apparatus and a guide portion formed on the main body portion, and the guide portion is attached to an outer needle. A guide hole that allows the puncture needle to be inserted from one side to the other side in a predetermined direction to guide the tip side portion of the puncture needle that is configured by inserting the inner needle to the site to be examined, and the outer peripheral surface of the guide portion. In the predetermined direction from one end to the other in the predetermined direction, the opening groove is located on one side in the predetermined direction and has a width wider than the outer diameter of the tip side portion of the puncture needle. It has a wide portion and a narrow portion located on the other side in the predetermined direction from the wide portion and having a width narrower than the width of the wide portion, and the wide portion projects from the inner needle protruding from the outer needle of the puncture needle. It extends in a predetermined direction longer than the amount. [Selection diagram]【課題】 ガイド孔部に穿刺針を挿入する際に穿刺針の針先が傷むことを抑制することができるガイド部材を提供する。【解決手段】 ガイド部材は、超音波診断装置に取り付けられるものであって、超音波診断装置に取り付けられる本体部分と、本体部分に形成されるガイド部分とを備え、ガイド部分は、外針に内針を挿入して構成されている穿刺針の先端側部分を被検部位へと案内すべく穿刺針を所定方向一方側から他方側へと挿通可能なガイド孔部と、ガイド部分の外周面において所定方向一方側の端部から他方に向かって形成されている開口溝とを有し、開口溝は、所定方向一方側に位置し且つ穿刺針の先端側部分の外径より広い幅を有する幅広部と、幅広部より所定方向他方側に位置し且つ前記幅広部の幅より狭い幅を有する幅狭部とを有し、幅広部は、穿刺針の外針から突き出ている内針の突出量より長く所定方向に延在している。【選択図】 図１
