A method for manufacturing an electronic component package comprises: (i) preparing a metal foil having opposed principal surface “A” for placement of an electronic component and principal surface “B”, and a through-hole located in an electronic component-placement region of surface “A”; (ii) placing the electronic component on the metal foil such that the electronic component is positioned in the electronic component-placement region, and an opening of the through-hole is capped with an electrode of the electronic component; (iii) forming a sealing resin layer on surface “A” such that the electronic component is covered with the sealing resin layer; and (iv) forming a metal plating layer on surface “B”. A dry plating process and a wet plating process are performed to form the metal plating layer in step (iv) such that the through-hole is filled with the metal plating layer, and the metal foil and the metal plating layer are integrated.