An electronic device comprising: a tray configured to be inserted into, or ejected from, the inside of the electronic device through an opening of a housing of the electronic device, and configured to have a space for receiving a card; an exterior cover configured to be movably coupled to the tray; and a first hooking structure configured to be disposed inside the electronic device to maintain the closed state of the exterior cover, or to release the closed state of the exterior cover by pressing the exterior cover; wherein the first hooking structure comprises: a first hooking portion configured to extend from the inner surface of the exterior cover; and a first retainer configured to be disposed inside the opening to maintain the closed state of the exterior cover by the coupling with the first hooking portion, wherein the first retainer includes an elastic body; wherein when the exterior cover is pressed, the exterior cover is moved to have a curved trajectory in the tray by means of a coupling structure; wherein the coupling structure comprises: one or more openings (722, 723) configured to be provided on the exterior cover to enable the curved trajectory movement of the exterior cover; and one or more coupling pins (73, 74) configured to be provided on the tray to be inserted into the respective openings (722, 723); and wherein the openings (722, 723) are configured to be formed to be spaced from each other, and to be long and curved. a tray configured to be inserted into, or ejected from, the inside of the electronic device through an opening of a housing of the electronic device, and configured to have a space for receiving a card; an exterior cover configured to be movably coupled to the tray; and a first hooking structure configured to be disposed inside the electronic device to maintain the closed state of the exterior cover, or to release the closed state of the exterior cover by pressing the exterior cover; wherein the first hooking structure comprises: a first hooking portion configured to extend from the inner surface of the exterior cover; and a first retainer configured to be disposed inside the opening to maintain the closed state of the exterior cover by the coupling with the first hooking portion, wherein the first retainer includes an elastic body; a first hooking portion configured to extend from the inner surface of the exterior cover; and a first retainer configured to be disposed inside the opening to maintain the closed state of the exterior cover by the coupling with the first hooking portion, wherein the first retainer includes an elastic body; wherein when the exterior cover is pressed, the exterior cover is moved to have a curved trajectory in the tray by means of a coupling structure; wherein the coupling structure comprises: one or more openings (722, 723) configured to be provided on the exterior cover to enable the curved trajectory movement of the exterior cover; and one or more coupling pins (73, 74) configured to be provided on the tray to be inserted into the respective openings (722, 723); and one or more openings (722, 723) configured to be provided on the exterior cover to enable the curved trajectory movement of the exterior cover; and one or more coupling pins (73, 74) configured to be provided on the tray to be inserted into the respective openings (722, 723); and wherein the openings (722, 723) are configured to be formed to be spaced from each other, and to be long and curved.