A while maintaining sufficient catalytic activity of the dehydrogenation catalyst by the coke deposited on the dehydrogenation catalyst efficiently removed, capable of realizing the efficiency of the overall process, the unsaturated hydrocarbon to provide a method for manufacturing. A raw material gas containing at least one hydrocarbon A is selected from the group consisting of alkanes and olefins, is contacted with a dehydrogenation catalyst comprising 14 genera metal element and Pt, from the group consisting of an olefin and a conjugated diene contact with the dehydrogenation to obtain a product gas containing at least one unsaturated hydrocarbon selected, the dehydrogenation catalysts after the dehydrogenation step, at a temperature of three hundred ten to four hundred and fifty ° C., a regeneration gas containing molecular oxygen and a reproduction step of method for producing unsaturated hydrocarbons. .BACKGROUND