An electronic device according to various embodiments of the present disclosure can comprise: a front plate facing a first direction; a rear plate facing a second direction, which is opposite to the first direction; at least one antenna module arranged between the front plate and the rear plate; and at least one heat dissipation sheet spaced from the at least one antenna module so as to be arranged to come in contact with the rear plate. The at least one heat dissipation sheet can comprise a ceramic filler and a binder resin mixed with the ceramic filler.