An egg settlement inducing substrate for shellfish includes: an iron member containing metallic iron； and a carbon member constituting an egg settlement inducing portion, wherein the carbon member is provided on an outer periphery of the iron member so that the carbon member and the metallic iron in the iron member are at least partly in contact with each other. This egg settlement inducing substrate has high and stable seed collection efficiency, and also the time for installing the egg settlement inducing substrate does not depend on the time of spawning and emergence of larvae in the settlement period.【課題】採苗効率が極めて高く安定し、その上、着卵材の設置時期も産卵時期に左右されない貝類の着卵材を提供する。【解決手段】金属鉄と、着卵部となる炭素材とを含み、該炭素材と該金属鉄との少なくとも一部が接触している構成とする。【選択図】図１
