A mounting apparatus for fixing a storage device to a chassis defining an opening includes two opposite fixing arms for supporting the storage device, a main body connecting the fixing arms, a latching member pivotably received in the main body, and an operating member slidably coupled to the main body. When the mounting apparatus is received in the chassis through the opening, and the operating member is pushed to drive the latching member to rotate, the latching portion protrudes outwardly from the main body and engages with an inside surface adjoining the opening of the chassis.