A foldable electronic device (100, 101, 400, 500) comprising: a foldable housing (300, 420, 501) including a first housing portion (310, 421), a second housing portion (320, 422), and a hinge structure (440, 540) connected with the first housing portion and the second housing portion, the foldable housing configured to be folded about a folding axis by the hinge structure; a flexible display (200, 410) disposed in the first housing portion and the second housing portion; a plurality of printed circuit boards, PCBs, including a first printed circuit board, PCB, disposed in the first housing portion and a second PCB disposed in the second housing portion; a first flexible printed circuit board, FPCB, configured to be connected with the first PCB and the second PCB via connection ends (551a, 551b) disposed at opposite ends thereof and include at least one RF signal line, the first FPCB including a first flexible portion located through a designated area of the hinge structure, a second FPCB configured to be connected with the first PCB and the second PCB via connection ends (552a, 552b) disposed at opposite ends thereof and include a power line, the second FPCB including a second flexible portion located through the designated area of the hinge structure, and an adhesive member attached to at least a portion of the first flexible portion of the first FPCB and at least a portion of the second flexible portion of the second FPCB together within the designated area of the hinge structure to maintain shapes of the at least a portion of the first flexible portion of the first FPCB and the at least a portion of the second flexible portion of the second FPCB by the adhesive member. a foldable housing (300, 420, 501) including a first housing portion (310, 421), a second housing portion (320, 422), and a hinge structure (440, 540) connected with the first housing portion and the second housing portion, the foldable housing configured to be folded about a folding axis by the hinge structure; a flexible display (200, 410) disposed in the first housing portion and the second housing portion; a plurality of printed circuit boards, PCBs, including a first printed circuit board, PCB, disposed in the first housing portion and a second PCB disposed in the second housing portion; a first flexible printed circuit board, FPCB, configured to be connected with the first PCB and the second PCB via connection ends (551a, 551b) disposed at opposite ends thereof and include at least one RF signal line, the first FPCB including a first flexible portion located through a designated area of the hinge structure, a second FPCB configured to be connected with the first PCB and the second PCB via connection ends (552a, 552b) disposed at opposite ends thereof and include a power line, the second FPCB including a second flexible portion located through the designated area of the hinge structure, and an adhesive member attached to at least a portion of the first flexible portion of the first FPCB and at least a portion of the second flexible portion of the second FPCB together within the designated area of the hinge structure to maintain shapes of the at least a portion of the first flexible portion of the first FPCB and the at least a portion of the second flexible portion of the second FPCB by the adhesive member.