An object of the present invention is to provide an in-vivo introduction instrument capable of reducing the burden on a patient and a medical staff by shortening the operation time by simplifying a surgical operation. (3 a, 3 b) on one of the pair of rod-like members, the operation unit (4 a, 4 b) on the other, and the motion transmission unit (5 a, 5 b) between the holding unit and the operation unit , And the gripping portion is opened and closed via the motion transmission portion in accordance with opening and closing of the operating portion, wherein the motion transmitting portion is configured to move the opening and closing motion of the operating portion Thereby forming a bi-lever mechanism to be transmitted as an opening and closing movement.この発明の課題は、手術操作を簡略化して手術時間を短縮することにより、患者及び医療従事者の負担を軽減することのできる生体内導入器具を提供すること。一対の棒状部材における一方に挟持部(3a、3b)を、他方に操作部(4a、4b)を、前記挟持部と前記操作部との間に運動伝達部(5a、5b)をそれぞれ有し、前記操作部の開閉に応じて前記運動伝達部を介して前記挟持部が開閉する生体内導入器具(1)であって、前記運動伝達部は、前記操作部の開閉運動を前記挟持部の開閉運動として伝達する両てこ機構を形成することを特徴とする生体内導入器具。
