Abstract: A heat sink device in a computer case is provided. The computer case comprises at least a plurality of ventilation holes and a plurality of exhaust holes formed on a sidewall thereof. At least a motherboard and a power supplier are installed within the computer case. The heat sink device comprises a scroll fan, installed inside the computer case below the power supplier. The scroll fan comprises an air inlet at a distal end and an air outlet at a primal end thereof. The air outlet is connected to the ventilation holes of the computer case. The scroll fan is adapted for generating air and circulating air within the computer case, and dissipating heat from inside the computer case.