An electronic device having a shielding structure disposed around electronic components and having high heat dissipation performance is provided. The electronic device includes a circuit board, at least one electronic component mounted on a surface of the circuit board, a shielding sheet attached to the surface of the circuit board to cover the at least one electronic component, a thermal interface material stacked on the shielding sheet to overlap the at least one electronic component, and a heat dissipation member disposed to face the surface of the circuit board, being in surface contact with the thermal interface material, and fastened to at least a portion of the circuit board by a fixing member. Various other embodiments may be possible.