Abstract: A fixing apparatus includes a supporting member defining a through hole and an opening, and a sliding member slidably mounted in the supporting member and including an engaging portion. An operating member is slidably mounted in the supporting member and is configured to slide the sliding member. A first pivoting member is pivotably mounted in the supporting member and is configured to be urged by the operating member. A second pivoting member is pivotably mounted in the supporting member and configured to be rotated by the first pivoting member, so extending a pushing plate out of the opening. In a locked position, the engaging portion extends out of the through hole and the pushing plate is located at a first position. In an unlocked position, the engaging portion is received in the supporting member and the pushing plate is located at a second position.