An exemplary dehydrogenation device for generating a hydrogen gas through dehydrogenation according to the present disclosure comprises an anode containing a dehydrogenation catalyst, a cathode containing catalyst capable of reducing protons, and a proton conductor disposed between the anode and the cathode. The proton conductor has a perovskite crystal structure expressed by the compositional formula AaB1-xB′xO3-δ. The A element is an alkaline-earth metal and is contained in a range of 0.4