A fan mounting apparatus includes a case and a fan. The case includes a bottom plate and a rear plate substantially perpendicular to the bottom plate. A clipping member extends to an interior of the rear plate in a first direction. The fan includes a sidewall with a securing portion. An extending direction of the securing portion is substantially perpendicular to the first direction. The securing portion includes a protruding surface. The securing portion is engaged with the clipping member, and the protruding surface abuts the clipping member.