Disclosed is a flat heat pipe that is thin and has an excellent heat transport property even when a deformation such as bending is applied. This heat pipe encloses an operating fluid which evaporates and radiates heat when heated and then condenses, and is provided with a wick which generates capillary force which returns the liquid-phase operating fluid to the position where the fluid evaporates; wherein the wick, which is formed as a bundle with which multiple fine wires (1) are bundled as a fine wire bundle (2) that is twisted around the center axis line thereof, is disposed touching both the top and bottom faces or the side faces within a flat container, and is disposed over the entire length in the longitudinal direction so as not to block the space which is an evaporation flow path, and either of the portions where the wick and the container make contact is sintered and immobilized over the entire length in the longitudinal direction.