An electronic device is provided. The electronic device includes a foldable housing including a hinge structure, a first housing connected to the hinge structure and including a first side wall structure and a first bracket located inside the first side wall structure, and a second housing connected to the hinge structure and including a second side wall structure and a second bracket located inside the second side wall structure, the second housing being folded with the first housing about the hinge structure, a display panel extending from the first housing to the second housing across the hinge structure and configured to output a screen, and a second antenna structure including a second ground and a second feeding portion disposed on the second side wall structure of the second housing, wherein the first side wall structure of the first housing and the second side wall structure of the second housing may include a first metal material, and the first bracket of the first housing includes the first metal material, and the second bracket of the second housing may include a second metal material.