An electronic device having a component-protecting structure, the device comprising: a front cover and a rear cover mutually coupled to form an appearance of the device; a component-mounted portion formed in a partial region of a receiving space, wherein the receiving space is defined in a side margin portion of the front cover or the rear cover; a plurality of components (70, 90) mounted onto the component-mounted portion so as to be exposed partially; and a component protection assembly, wherein the component protection assembly includes: a protection cover having a shape corresponding to a shape of the receiving space and being constructed for opening/closing the receiving space; a hinge installed in one end of the receiving space to pivotably support one end of the protection cover; and a cover holder installed in the other end of the receiving space and being constructed for locking or unlocking the protection cover via a clockwise or counterclockwise rotation of the cover holder, wherein the cover holder includes: a holder pin passing through the other end of the protection cover and configured to rotate clockwise or counterclockwise; an elastic member coupled between the protection cover and the holder pin configured to elastically support the holder pin in an insertion direction thereof; a holder body coupled to the holder pin and rotatable via rotation of the holder pin; and a holder bracket coupled to one side of inside of the receiving space via a holder screw, wherein the holder bracket has a stopper groove to latch or unlatch the holder body. a front cover and a rear cover mutually coupled to form an appearance of the device; a component-mounted portion formed in a partial region of a receiving space, wherein the receiving space is defined in a side margin portion of the front cover or the rear cover; a plurality of components (70, 90) mounted onto the component-mounted portion so as to be exposed partially; and a component protection assembly, wherein the component protection assembly includes: a protection cover having a shape corresponding to a shape of the receiving space and being constructed for opening/closing the receiving space; a hinge installed in one end of the receiving space to pivotably support one end of the protection cover; and a cover holder installed in the other end of the receiving space and being constructed for locking or unlocking the protection cover via a clockwise or counterclockwise rotation of the cover holder, a protection cover having a shape corresponding to a shape of the receiving space and being constructed for opening/closing the receiving space; a hinge installed in one end of the receiving space to pivotably support one end of the protection cover; and a cover holder installed in the other end of the receiving space and being constructed for locking or unlocking the protection cover via a clockwise or counterclockwise rotation of the cover holder, wherein the cover holder includes: a holder pin passing through the other end of the protection cover and configured to rotate clockwise or counterclockwise; an elastic member coupled between the protection cover and the holder pin configured to elastically support the holder pin in an insertion direction thereof; a holder body coupled to the holder pin and rotatable via rotation of the holder pin; and a holder bracket coupled to one side of inside of the receiving space via a holder screw, wherein the holder bracket has a stopper groove to latch or unlatch the holder body. a holder pin passing through the other end of the protection cover and configured to rotate clockwise or counterclockwise; an elastic member coupled between the protection cover and the holder pin configured to elastically support the holder pin in an insertion direction thereof; a holder body coupled to the holder pin and rotatable via rotation of the holder pin; and a holder bracket coupled to one side of inside of the receiving space via a holder screw, wherein the holder bracket has a stopper groove to latch or unlatch the holder body.