A spark-preventing element embedded in a printed circuit board includes a capacitive output electrode, a capacitive input electrode, an interlayer conductive member electrically connecting the capacitive output electrode to a signal line, and an interlayer insulation member electrically insulating the capacitive input electrode from the signal line, The capacitive input electrode is spaced apart from the capacitive output electrode with an air gap disposed between the capacitive output electrode and the capacitive input electrode, surrounds the capacitive output electrode, and is electrically connected to the ground layer. The spark-preventing element has an improved electrical characteristic and an increased durability.