Heat sink having heat-dissipating fins capable of increasing heat-dissipating area

A heat sink (1) having heat-dissipating fins (30) capable of increasing heat-dissipating area, comprising:

• a heat pipe (20) having a heat-absorbing section (21) and a heat-releasing section (22) extending from the heat-absorbing section (21);
• and
• a plurality of heat-dissipating fins (30) each having a lower plate (31) and an upper plate (32) extending from the lower plate (31), the upper plate (32) being folded to form an overlapping portion attached on the lower plate (31), thereby forming a heat-dissipating path (b) between the lower plate (31) and the upper plate (32) at a folding area, wherein a through-hole (33) is formed in the lower plate (31) and the upper plate (32) at the overlapping portion, and a periphery of the through-hole (33) is formed with an inner annular wall (311) extending from the lower plate (31), and an outer annular wall (321) extending from the upper plate (32) and abuttedly surrounding the inner annular wall (311), the heat-releasing section (22) of the heat pipe (20) penetrating the through-holes (33) of the heat-dissipating fins (30) successively so that the inner annular wall (311) is brought into thermal contact with the heat-releasing section (22) of the heat pipe (20).