An electronic device comprising: a first structure; a second structure coupled to the first structure to move relative thereto in a first direction or a second direction opposite to the first direction; a display configured such that a partial area is disposed on the second structure to move together with the second structure and at least part of a remaining area is located inside the first structure, wherein a size of an area of the display configured to form a front side of the electronic device is changed as the second structure moves; a display support member attached to at least part of a rear surface of the display to support the display together with the second structure and including a first end portion and a second end portion; and a plurality of circuit boards disposed inside the first structure, the plurality of circuit boards including at least one printed circuit board, wherein the first structure includes: a first side member and a second side member configured to form lateral sides of the electronic device; and a first guide member and a second guide member configured to guide a movement of the display support member, wherein the first guide member and the second guide member include guide grooves in which the first end portion and second end portion of the display support member are accommodated, and wherein at least part of the second side member passes through the second guide member and makes contact with a contact member disposed on at least a part of the plurality of circuit boards, such that the second side member is electrically connected to the plurality of circuit boards. a first structure; a second structure coupled to the first structure to move relative thereto in a first direction or a second direction opposite to the first direction; a display configured such that a partial area is disposed on the second structure to move together with the second structure and at least part of a remaining area is located inside the first structure, wherein a size of an area of the display configured to form a front side of the electronic device is changed as the second structure moves; a display support member attached to at least part of a rear surface of the display to support the display together with the second structure and including a first end portion and a second end portion; and a plurality of circuit boards disposed inside the first structure, the plurality of circuit boards including at least one printed circuit board, wherein the first structure includes: a first side member and a second side member configured to form lateral sides of the electronic device; and a first guide member and a second guide member configured to guide a movement of the display support member, wherein the first guide member and the second guide member include guide grooves in which the first end portion and second end portion of the display support member are accommodated, and wherein at least part of the second side member passes through the second guide member and makes contact with a contact member disposed on at least a part of the plurality of circuit boards, such that the second side member is electrically connected to the plurality of circuit boards. a first side member and a second side member configured to form lateral sides of the electronic device; and a first guide member and a second guide member configured to guide a movement of the display support member, wherein the first guide member and the second guide member include guide grooves in which the first end portion and second end portion of the display support member are accommodated, and wherein at least part of the second side member passes through the second guide member and makes contact with a contact member disposed on at least a part of the plurality of circuit boards, such that the second side member is electrically connected to the plurality of circuit boards.