An LED lamp system includes a light emitting diode (LED) lamp, a printed circuit board on which the LED lamp is mounted, a connection terminal including a soldering part inserted and soldered to the printed circuit board, a body part extending parallel to the printed circuit board, and a branch part extending from the body part in a predetermined direction, a case to which the printed circuit board is fixed, the case including a holding portion for holding the branch part of the connection terminal, and a cover for enclosing the LED lamp and the printed circuit board in association with the case.