A heat dissipation device includes a base and a fin group fixed on the base. The base includes a container, a flattened heat pipe and a solid supporting member. The container includes a baffle plate and a cover engaging with the baffle plate to define a receiving chamber therebetween. The heat pipe and the supporting member are housed in the receiving chamber. Opposite sides of the heat pipe and the supporting member respectively abut against the baffle plate and the cover of the container.
