The present invention relates to a vascular embolization device having the function of administering a biochemical active material and also having high flexibility. Specifically, the vascular embolization device includes a coil and a biochemical active material-containing resin wire inserted in the inside of the coil, in which the resin wire is a multilayer strand including a core and at least one outer layer, and the core and the at least one outer layer individually include resin compositions with solubilities different from each other in the same organic solvent.
