A light-emitting device with excellent heat dissipation properties is provided having a conductor layer for light reflection with high light reflectance, less susceptibility to deterioration of the reflectance due to corrosion, and improved light extraction efficiency. The device contains a ceramic substrate having a lower ceramic layer, a conductor layer for light reflection formed on a desired area of the lower ceramic layer surface, an upper ceramic layer formed so as to cover at least a part of the conductor layer for light reflection, and a light-emitting element disposed on the upper side of the upper ceramic layer of the ceramic substrate, such that the upper ceramic layer has a thickness of from 5 to 100 μm.