Patent ID: 7436670

Claim:
A heat sink retaining device, for retaining a heat sink on a chip unit, comprising: a retaining component, having a pressing portion and a hook portion, the retaining component pressing the heat sink by the pressing portion and being locked to the heat sink by the hook portion, wherein two opposite ends of the retaining component have at least one ear portion and two holes respectively located at the ear portion; and a rotating component, having a clamping portion and being pivotally disposed on the retaining component and pivotally rotated between a locking position and a release position, wherein when the rotating component is at the locking position, the clamping portion is snapped onto the chip unit, so that the pressing portion firmly presses the heat sink and the chip unit, wherein two opposite ends of the rotating component have at least one penetrating portion and a penetrating shaft located in the penetrating portion for penetrating the holes, so that the rotating component is pivotally disposed and snapped onto the retaining component.