An electronic device (101; 200; 300) comprising: a first printed circuit board (331; 510; 710) including a first surface facing a first direction and a second surface facing a second direction opposite to the first direction; a second printed circuit board (332; 520; 720) disposed to be spaced apart from the first printed circuit board and including a third surface facing the first direction and a fourth surface facing the first surface of the first printed circuit board; at least one electronic component disposed on the second printed circuit board (332; 520; 720); an interposer located between the first printed circuit board and the second printed circuit board and electrically connecting the first printed circuit board and the second printed circuit board; and a shield structure (600; 800) located on at least one region of the third surface of the second printed circuit board (332; 520; 720) and electromagnetically shielding the at least one electronic component, wherein the shield structure (600; 800) comprises: a body located on the third surface of the second printed circuit board; and a first extension protruding from the body and connecting the body and the first printed circuit board (331; 510; 710), and wherein the first extension comprises: a first portion protruding in a third direction perpendicular to the first direction with reference to the body; a second portion extending along the second direction with reference to one end of the first portion and connecting the first portion and a third portion; and the third portion connected to one end of the second portion facing the first printed circuit board (331; 510; 710), and wherein the first portion is fixed to at least one region of the third surface of the second printed circuit board (332; 520; 720) and the third portion is fixed to at least one region of the first surface of the first printed circuit board (331; 510; 710) such that a physical connection strength between the first printed circuit board and the second printed circuit board increases. a first printed circuit board (331; 510; 710) including a first surface facing a first direction and a second surface facing a second direction opposite to the first direction; a second printed circuit board (332; 520; 720) disposed to be spaced apart from the first printed circuit board and including a third surface facing the first direction and a fourth surface facing the first surface of the first printed circuit board; at least one electronic component disposed on the second printed circuit board (332; 520; 720); an interposer located between the first printed circuit board and the second printed circuit board and electrically connecting the first printed circuit board and the second printed circuit board; and a shield structure (600; 800) located on at least one region of the third surface of the second printed circuit board (332; 520; 720) and electromagnetically shielding the at least one electronic component, wherein the shield structure (600; 800) comprises: a body located on the third surface of the second printed circuit board; and a first extension protruding from the body and connecting the body and the first printed circuit board (331; 510; 710), and a body located on the third surface of the second printed circuit board; and a first extension protruding from the body and connecting the body and the first printed circuit board (331; 510; 710), and wherein the first extension comprises: a first portion protruding in a third direction perpendicular to the first direction with reference to the body; a second portion extending along the second direction with reference to one end of the first portion and connecting the first portion and a third portion; and the third portion connected to one end of the second portion facing the first printed circuit board (331; 510; 710), and a first portion protruding in a third direction perpendicular to the first direction with reference to the body; a second portion extending along the second direction with reference to one end of the first portion and connecting the first portion and a third portion; and the third portion connected to one end of the second portion facing the first printed circuit board (331; 510; 710), and wherein the first portion is fixed to at least one region of the third surface of the second printed circuit board (332; 520; 720) and the third portion is fixed to at least one region of the first surface of the first printed circuit board (331; 510; 710) such that a physical connection strength between the first printed circuit board and the second printed circuit board increases.