A mounting apparatus for fixing an expansion card to a circuit board, includes a mounting member fixed on the circuit board, and a locking member. The mounting member includes a pivot portion and a mounting portion formed on two ends thereof respectively. A hook extends from the pivot portion. The locking member includes a connecting portion and a latch portion formed on two ends thereof respectively. A notch is defined in the connecting portion. The locking member is pivotably connected to the mounting member via the connecting portion of the locking member connecting to the pivot portion of the mounting member. The latch portion is capable of being inserted in the mounting portion to fix the expansion card to the supporter. The hook is capable of engaging in the notch to confine the locking member relative to the mounting member.