A heat dissipater having capillary component includes: a heat spreader including a shell member having at least one through hole and a first capillary structure disposed in the shell member; a heat pipe, received in the through hole and including a pipe member and a second capillary structure disposed in the pipe member. The pipe member includes an opening formed in the shell member; and a capillary component, accommodated in the shell member and including a block member extended with a protruding part and arranged adjacent to the first capillary structure. The protruding part is received in the opening and arranged adjacent to the second capillary structure. Accordingly, the heat pipe and the heat spreader can be combined for operation, and an internal working fluid can flow between the heat pipe and the heat spreader.