A portable electronic device (100, 200, 300, 400, 500, 700, 800) comprising: a front cover (310, 410) configured to form a front of the electronic device (100, 200, 300, 400, 500, 700, 800); a back cover (320, 420) configured to form a back of the electronic device (100, 200, 300, 400, 500, 700, 800); a sidewall (331, 431) configured to surround at least a portion of an internal space formed between the front cover (310, 410) and the back cover (320, 420); a display device located in the internal space and comprising a screen area configured to be exposed through the front cover (310, 410); and characterised by a first structure located within the internal space and extending from the sidewall (331, 431), the first structure comprising a first surface directed toward the front cover (310, 410), a second surface directed toward the back cover (320, 420), and a through-hole extending from the first surface to the second surface; a non-conductive structure disposed within and filling the through-hole, the non-conductive structure comprising a third surface directed toward the front cover (310, 410), a fourth surface directed toward the back cover (320, 420), and a via-hole; a first conductive connecting member disposed within and filling the via-hole of the non-conductive structure, the first conductive connecting member comprising a fifth surface directed toward the front cover (310, 410) and a sixth surface directed toward the back cover (320, 420); a first space communicating with at least one opening formed in the sidewall (331, 431), at least a part of the first space being surrounded by at least one of a part of the sidewall (331, 431) or a part of the first structure; a second conductive connecting member comprising a first part, a second part, and a third part, the first part disposed within the first space, the second part extending to the fourth surface of the non-conductive structure, and the third part electrically contacting the first conductive connecting member; a second space at least partially surrounded by another part of the first structure and the non-conductive structure, the second space configured to be hermetically sealed from the first space; and a printed circuit board disposed within the second space and electrically connected with the first conductive connecting member. a front cover (310, 410) configured to form a front of the electronic device (100, 200, 300, 400, 500, 700, 800); a back cover (320, 420) configured to form a back of the electronic device (100, 200, 300, 400, 500, 700, 800); a sidewall (331, 431) configured to surround at least a portion of an internal space formed between the front cover (310, 410) and the back cover (320, 420); a display device located in the internal space and comprising a screen area configured to be exposed through the front cover (310, 410); and characterised by a first structure located within the internal space and extending from the sidewall (331, 431), the first structure comprising a first surface directed toward the front cover (310, 410), a second surface directed toward the back cover (320, 420), and a through-hole extending from the first surface to the second surface; a non-conductive structure disposed within and filling the through-hole, the non-conductive structure comprising a third surface directed toward the front cover (310, 410), a fourth surface directed toward the back cover (320, 420), and a via-hole; a first conductive connecting member disposed within and filling the via-hole of the non-conductive structure, the first conductive connecting member comprising a fifth surface directed toward the front cover (310, 410) and a sixth surface directed toward the back cover (320, 420); a first space communicating with at least one opening formed in the sidewall (331, 431), at least a part of the first space being surrounded by at least one of a part of the sidewall (331, 431) or a part of the first structure; a second conductive connecting member comprising a first part, a second part, and a third part, the first part disposed within the first space, the second part extending to the fourth surface of the non-conductive structure, and the third part electrically contacting the first conductive connecting member; the first part disposed within the first space, the second part extending to the fourth surface of the non-conductive structure, and the third part electrically contacting the first conductive connecting member; a second space at least partially surrounded by another part of the first structure and the non-conductive structure, the second space configured to be hermetically sealed from the first space; and a printed circuit board disposed within the second space and electrically connected with the first conductive connecting member.