A method of manufacturing an amorphous alloy magnetic core, which includes preparing a layered body by layering amorphous alloy thin strips one on another, and has one end face and another end face in a width direction of the thin strips and an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the thin strips; forming a hole passing through from the one end face of the layered body as a starting point; subjecting the layered body to which the hole has been formed to a heat treatment while measuring an internal temperature of the hole; and forming a resin layer which blocks the hole and covers at least a part of the one end face by coating and curing a two-liquid mixed type epoxy resin composition having a viscosity of from 38 Pa·s to 51 Pa·s and a T. I. value of from 1.6 to 2.7 on at least a part of at least the one end face of the layered body after being subjected to the heat treatment.