PROBLEM TO BE SOLVED: To provide a chemical heat pump utilizing thermal energy by utilizing dehydrogenation and hydrogenation by a facility smaller than before.SOLUTION: The chemical heat pump 50 includes: a dehydrogenation reactor 1 provided with a dehydrogenation section performing the dehydrogenation of a hydrogen containing compound by using thermal energy applied from the outside, and forming a dehydrogenated compound and hydrogen; a hydrogenation reactor 21 forming the hydrogen containing compound by performing the hydrogenation of the dehydrogenated compound by introducing the dehydrogenated compound and the hydrogen formed by the dehydrogenation reactor 1, and outputting the generated reaction heat as thermal energy; and a separating section 41 provided with a separation membrane 44 permeating both the unreacted hydrogen and the dehydrogenated compound sent out from the hydrogenation reactor.