An electronic device, comprising: a housing including two opposite open ends and including an upper housing and a lower housing; an adhesive material disposed between the upper housing and the lower housing to couple the upper housing and the lower housing; a coating layer formed on an outer surface of the adhesive material to have a curvature corresponding to the curvature of the upper housing part and the lower housing part; and a display device disposed inside the housing and configured to display information to the outside through a portion of the housing; wherein the upper housing includes a first surface facing in a first direction, a first side surface extending from the first surface and forming a curved surface, and a second side surface opposite to the first side surface, extending from the first surface and forming a curved surface; wherein the lower housing includes a second surface facing in a second direction opposite to the first direction, a third side surface extending from the second surface and forming a curved surface, and a fourth side surface opposite to the third side surface, extending from the first surface and forming a curved surface; wherein the first side surface and the third side surface have the same curvature and the second side surface and the fourth side surface have the same curvature; wherein the adhesive material is disposed along a joining line between the first side surface and the third side surface and between the second side surface and the fourth side surface; wherein the adhesive material is configured to join the first side surface and the third side surface, and the second side surface and the fourth side surface through a curing process; wherein the cured adhesive material along the joining line is polished through a polishing process; and wherein the coating layer is formed on the polished adhesive material. a housing including two opposite open ends and including an upper housing and a lower housing; an adhesive material disposed between the upper housing and the lower housing to couple the upper housing and the lower housing; a coating layer formed on an outer surface of the adhesive material to have a curvature corresponding to the curvature of the upper housing part and the lower housing part; and a display device disposed inside the housing and configured to display information to the outside through a portion of the housing; wherein the upper housing includes a first surface facing in a first direction, a first side surface extending from the first surface and forming a curved surface, and a second side surface opposite to the first side surface, extending from the first surface and forming a curved surface; wherein the lower housing includes a second surface facing in a second direction opposite to the first direction, a third side surface extending from the second surface and forming a curved surface, and a fourth side surface opposite to the third side surface, extending from the first surface and forming a curved surface; wherein the first side surface and the third side surface have the same curvature and the second side surface and the fourth side surface have the same curvature; wherein the adhesive material is disposed along a joining line between the first side surface and the third side surface and between the second side surface and the fourth side surface; wherein the adhesive material is configured to join the first side surface and the third side surface, and the second side surface and the fourth side surface through a curing process; wherein the cured adhesive material along the joining line is polished through a polishing process; and wherein the coating layer is formed on the polished adhesive material.