A sintered heat pipe having a metal tube of which an inner wall is formed with a plurality of capillary grooves extending in a longitudinal direction; and a sintered powder layer partially covering the capillary grooves. The sintered powder layer is circumferentially sintered onto the inner wall of the tube. The capillary grooves extend from one end of the metal tube but do not extend to the other end of the metal tube, leaving a section of the metal tube uncovered. The sintered powder layer extends from the other end of the metal tube but does not extend to the one end of the metal tube so as to cover the section of the metal tube uncovered by the capillary grooves.