Provided are a light-emitting element capable of reducing power consumption by increasing its light extraction efficiency and a light-emitting device using the light-emitting element. A light-emitting element includes a composite material, which contains an organic compound having a high hole-transport property and an electron acceptor and in which the spin density measured by an electron spin resonance (ESR) method is less than or equal to 1×1019 spins/cm3, the spin density is less than or equal to 3×1019 spins/cm3 when the molar ratio of the electron acceptor to the organic compound is greater than or equal to 1, or the spin density is less than or equal to 5×1019 spins/cm3 when the molar ratio is greater than or equal to 2.