A mold (10, 70, 100) for producing an in-vivo indwelling member in which a three-dimensional shape is imparted to a linear primary coil, wherein the mold (10, 70, 100) has an assembled state and an unfolded state. In the assembled state, the variable member is connected to the outer part (19, 79, 119) arranged outside and the outer part (19, 79, 119) while being connected to the inner part. And the inner part (19a, 79a, 119a) and the inner part (19a, 79a, 119a) have a holding part for holding the primary coil. . With the mold (10, 70, 100), for example, an in-vivo indwelling member having a three-dimensional shape that can be stably placed in an aneurysm such as an aneurysm can be easily produced.線状の一次コイルに立体形状が付与された生体内留置部材を製造するための型(10,70,100)であって、該型(10,70,100)は、組立状態と展開状態とに変形可能な可変部材を備え、該可変部材は、組立状態において、外側に配置される外側部(19,79,119)と、該外側部(19,79,119)と連結されつつその内側に配置される内側部(19a,79a,119a)とを有し、前記外側部(19,79,119)及び内側部(19a,79a,119a)は、前記一次コイルを保持する保持部を有する。 該型(10,70,100)により、例えば、動脈瘤等の瘤内で安定的に配置することが可能な立体形状を有する生体内留置部材を簡便に作製することが可能となる。