An electronic device (101, 102, 104, 200, 300, 640) comprising: a first housing (210, 350, 550, 650, 750, 1160) including a first through-hole (380, 680, 780); a second housing (220, 360, 660, 760) including a second through-hole (390, 690, 790); at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) passing via the first through-hole (380, 680, 780) and the second through-hole (390, 690, 790); a first support bracket (320a, 520, 620a, 720a) disposed between the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) and a display (230, 301, 601, 701, 1290) configured to support the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) while covering the first through-hole (380, 680, 780); a second support bracket (320b, 620b, 720b) disposed between the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) and the display (230, 301, 601, 701, 1290) configured to support the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) while covering the second through-hole (390, 690, 790); a first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) disposed to face a partial area of the first through-hole (380, 680, 780) from the first support bracket (320a, 520, 620a, 720a) and inserted into the partial area of the first through-hole (380, 680, 780); a second waterproof member (340a, 740a, 840, 940, 1040, 1140) facing the first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) while the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) is interposed therebetween, and inserted into remaining areas of the first through-hole (380, 680, 780); a third waterproof member (330b, 730b) disposed to face a partial area of the second through-hole (390, 690, 790) from the second support bracket (320b, 620b, 720b) and inserted into the partial area of the second through-hole (390, 690, 790); a fourth waterproof member (340b, 740b) facing the third waterproof member (330b, 730b) while the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) is interposed therebetween, and inserted into remaining areas of the second through-hole (390, 690, 790); a first sealing member (310a, 710a, 1110) disposed on the first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) and the second waterproof member (340a, 740a, 840, 940, 1040, 1140); and a second sealing member (310b, 710b) disposed on the third waterproof member (330b, 730b) and the fourth waterproof member (340b, 740b). a first housing (210, 350, 550, 650, 750, 1160) including a first through-hole (380, 680, 780); a second housing (220, 360, 660, 760) including a second through-hole (390, 690, 790); at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) passing via the first through-hole (380, 680, 780) and the second through-hole (390, 690, 790); a first support bracket (320a, 520, 620a, 720a) disposed between the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) and a display (230, 301, 601, 701, 1290) configured to support the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) while covering the first through-hole (380, 680, 780); a second support bracket (320b, 620b, 720b) disposed between the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) and the display (230, 301, 601, 701, 1290) configured to support the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) while covering the second through-hole (390, 690, 790); a first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) disposed to face a partial area of the first through-hole (380, 680, 780) from the first support bracket (320a, 520, 620a, 720a) and inserted into the partial area of the first through-hole (380, 680, 780); a second waterproof member (340a, 740a, 840, 940, 1040, 1140) facing the first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) while the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) is interposed therebetween, and inserted into remaining areas of the first through-hole (380, 680, 780); a third waterproof member (330b, 730b) disposed to face a partial area of the second through-hole (390, 690, 790) from the second support bracket (320b, 620b, 720b) and inserted into the partial area of the second through-hole (390, 690, 790); a fourth waterproof member (340b, 740b) facing the third waterproof member (330b, 730b) while the at least one flexible circuit board (370, 570, 670, 770, 870, 970, 1070, 1170, 1270) is interposed therebetween, and inserted into remaining areas of the second through-hole (390, 690, 790); a first sealing member (310a, 710a, 1110) disposed on the first waterproof member (330a, 530, 730a, 830, 930, 1030, 1130) and the second waterproof member (340a, 740a, 840, 940, 1040, 1140); and a second sealing member (310b, 710b) disposed on the third waterproof member (330b, 730b) and the fourth waterproof member (340b, 740b).