Disclosed is an electronic device includes a flexible circuit board passing via a first through-hole included in a first housing and a second through-hole included in a second housing, a first support bracket disposed to support the flexible circuit board while covering the first through-hole, a second support bracket disposed to support the flexible circuit board while covering the second through-hole, a first waterproof member disposed to face a partial area of the first through-hole from the first support bracket and inserted into the partial area of the first through-hole, a second waterproof member inserted into the remaining areas of the first through-hole, a third waterproof member disposed to face a partial area of the second through-hole from the second support bracket and inserted into the partial area of the second through-hole, a fourth waterproof member inserted into the remaining areas of the second through-hole.