A method for manufacturing a light-emitting element, in particular, a method for manufacturing a light-emitting element with high emission efficiency is provided. In the method for manufacturing a light-emitting element that includes a light-emitting layer containing a host material and a light-emitting material that is an organic compound or an organic metal complex, the light-emitting layer is formed by co-evaporation of the light-emitting material and the host material, and the light-emitting layer is deposited by co-evaporation while the percentage of the partial pressure of carbon dioxide with respect to the total pressure in an evaporation chamber for the co-evaporation is kept higher than that in the air.