The present invention has a shape that is curved in various directions and is easy to spread inside an aneurysm, etc., can be in close contact with the inner wall of an aneurysm, etc., and can be prevented from falling off, and the indwelling density can be further improved. It is an object of the present invention to provide an in-vivo indwelling member that can maintain good operability and an in-vivo indwelling member arranging device including the in-vivo indwelling member. The primary coil (11) is provided with two or more solid parts (medium solid 4A, large solid 4B), and each solid part has at least four shape parts (51a to 51e / 52a to four planes). 52f) is a three-dimensional part configured in a continuous manner, and the normal directions of the four planes are all orthogonal to the predetermined common axis (a1 / a2) direction, and at least these four curved portions (51a to 51a) 51e / 52a to 52f) are formed in any one of the surfaces of the quadrangular virtual cylindrical body as viewed from the common axis (a1 / a2) surrounded by the four planes.本発明は、様々な方向に複雑に湾曲して動脈瘤などの内部に広がりやすい形状を有しつつ、動脈瘤などの内壁に密着した状態となって脱落を防止でき、留置密度もより向上させることができ、良好な操作性も維持できる生体内留置部材、及びこれを備える生体内留置部材配置装置を提供することを課題とする。 一次コイル（１１）に２つ以上の立体部（中立体４Ａ，大立体４Ｂ）の形状を設けたもので、各立体部は、４つの平面にわたって少なくとも４つの形状部位（５１ａ～５１ｅ／５２ａ～５２ｆ）が連設されて構成される立体部とし、４つの平面の法線方向はすべて所定の共通軸（ａ１／ａ２）方向に直交する関係にあり、これら少なくとも４つの湾曲形状部位（５１ａ～５１ｅ／５２ａ～５２ｆ）は、前記４つの平面で囲まれる前記共通軸（ａ１／ａ２）から見て四角形の仮想筒状体の各面内のいずれかに形成した。
