A retaining device for expansion cards includes a retaining bracket (3) and a computer rear panel (4). The retaining bracket includes a pressing body (32), two operating arms (34) extending from respective opposite ends of the pressing body, and two pairs of pivots (36). Each operating arm has a resilient pressing finger (346), and a locking detent (348) formed at a distal end of the pressing finger. The rear panel includes a first plate (40), and a second plate (42) defining two openings (44). The pivots of the retaining bracket are pivotably mounted to the second plate of the rear panel. The retaining bracket sandwiches a slot cover (11) of each expansion card with the first plate. The locking detents are snappingly engaged with the second plate in the openings.

 
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