A mounting apparatus for mounting an expansion card to a printed circuit board (PCB), includes a connector on the PCB, and a latch member pivotably connected to the connector. The connector defines a slot to receive the expansion card. The latch member is a rectangular wire frame comprising a lock portion, two connection arms extending down from the lock portion, and two pivot portions extending from distal ends of the connection arms toward each other. The pivot portions are pivotably attached to two sidewalls of the connector. After the expansion card is plugged into the slot of the connector, the latch member is pivoted to make the lock portion press against a portion of the expansion card, thereby locking the expansion card to the connector.