A mounting apparatus includes a storage bracket (30), an operating member (60), a locking member (50) and a pair of springs (70). The operating member has at least one slant portion (647). The locking member is restrained from moving along with the operating member. The locking member has at least one inserting pin (54) and at least one sliding tab (56). The springs press on the locking member to urge the inserting pin to extend into the storage bracket. The inserting pin of the locking member is lifted out of the storage bracket by the slant portion of the operating member edging the sliding tab of the locking member out, when the operating member is pushed.