A cooler comprises a base, a set of radiator fins and a plurality of heat pipes going through the base and the radiator fins. The lower surface of the base is further provided with a recess wherein part of the heat pipes is exposed, whereby a heat-generating element will be embedded with in the recess, and whereby the heat generated in the element will be conducted quickly through the heat pipes to the radiator fins. Therefore, the heat-dissipation efficiency is enhanced.