According to various embodiments of the present disclosure, an electronic device may include a first housing, a second housing connected to the first housing via a hinge structure, an electronic component, a flexible display being configured to be foldable according to rotation, a heat dissipation sheet arranged under the flexible display, and a first adhesive layer configured to bond the flexible display and the heat dissipation sheet to each other. The heat dissipation sheet may include a first portion corresponding to the first housing, a second portion corresponding to the second housing, and a third portion interconnecting the first portion and the second portion and corresponding to the hinge structure. The third portion may include a structure that protrudes or is folded at least once with respect to the first portion and the second portion. The first adhesive layer may include a first opening corresponding to the third portion.