A heat dissipation device adapted for dissipating heat from a heat-generating device includes a heat pipe assembly and a fin set. The heat pipe assembly is adapted for absorbing heat from the heat-generating device, and includes a plurality of bending heat pipes each having a top face and a bottom face. The fin set thermally engaged with the heat pipe assembly includes a plurality of fins and has a bottom surface cooperatively formed by bottom edges of the fins. The heat pipes of the heat pipe assembly are juxtaposed with each other; the top faces of the heat pipes are thermally attached to the bottom surface of the fin set; the bottom faces of the heat pipes are positioned level with each other to form a contacting surface for contacting with the heat generating device.