A loop heat pipe includes an evaporator to vaporizes a working fluid, a condenser to liquefy the working fluid, a liquid pipe to connect the evaporator and the condenser, and a vapor pipe to connect the evaporator and the condenser, and form a loop-shaped passage together with the liquid pipe. A recess is formed in at least a portion of an outer wall surface of a pipe wall of the evaporator, the condenser, the liquid pipe, and the vapor pipe.