An electronic device comprising: a supporting member (101, 201); a case member (102, 202) coupled with the supporting member (101, 201) to surround the side surface of the supporting member (101, 201); and a front cover attached to a first surface of the supporting member (101, 201) while surrounded by the case member (102, 202), wherein the supporting member (101, 201) has a plurality of supporting protrusions (115, 215) formed along a side surface of the supporting member (101, 201), the supporting protrusions (115, 215) are supported by an inside surface of the case member (102, 202) to couple the supporting member (101, 201) to the case member (102, 202) and the case member (102, 202) is spaced apart from a periphery of the front cover, wherein the case member (102, 202) includes a rear surface portion positioned opposite a second surface of the supporting member (101, 201), wherein the first surface of the supporting member (101, 201) is positioned opposite the second surface of the supporting member (101, 201), wherein a first side wall extends from the rear surface portion of the case member (102, 202) and disposed to surround the side surface of the supporting member (101, 201), and wherein an end of the first side wall is positioned in the periphery of the front cover, the electronic device characterized by comprising: a second side wall extending from the rear surface portion of the case member (102, 202) and facing an inside surface of the first side wall; and a first coupling member extending from the second surface of the supporting member (101, 201) and having the supporting protrusions (115, 215) formed on an outside surface thereof, wherein the first coupling member is coupled between the first side wall and the second side wall, the electronic device further comprising a second coupling member protruding from the second surface of the supporting member (101, 201) and facing the first coupling member, and wherein the second side wall is coupled between the first coupling member and the second coupling member. a supporting member (101, 201); a case member (102, 202) coupled with the supporting member (101, 201) to surround the side surface of the supporting member (101, 201); and a front cover attached to a first surface of the supporting member (101, 201) while surrounded by the case member (102, 202), wherein the supporting member (101, 201) has a plurality of supporting protrusions (115, 215) formed along a side surface of the supporting member (101, 201), the supporting protrusions (115, 215) are supported by an inside surface of the case member (102, 202) to couple the supporting member (101, 201) to the case member (102, 202) and the case member (102, 202) is spaced apart from a periphery of the front cover, wherein the case member (102, 202) includes a rear surface portion positioned opposite a second surface of the supporting member (101, 201), wherein the first surface of the supporting member (101, 201) is positioned opposite the second surface of the supporting member (101, 201), wherein a first side wall extends from the rear surface portion of the case member (102, 202) and disposed to surround the side surface of the supporting member (101, 201), and wherein an end of the first side wall is positioned in the periphery of the front cover, the electronic device characterized by comprising: a second side wall extending from the rear surface portion of the case member (102, 202) and facing an inside surface of the first side wall; and a first coupling member extending from the second surface of the supporting member (101, 201) and having the supporting protrusions (115, 215) formed on an outside surface thereof, a second side wall extending from the rear surface portion of the case member (102, 202) and facing an inside surface of the first side wall; and a first coupling member extending from the second surface of the supporting member (101, 201) and having the supporting protrusions (115, 215) formed on an outside surface thereof, wherein the first coupling member is coupled between the first side wall and the second side wall, the electronic device further comprising a second coupling member protruding from the second surface of the supporting member (101, 201) and facing the first coupling member, and wherein the second side wall is coupled between the first coupling member and the second coupling member.