A light-emitting device is disclosed as typified by a laser oscillator formed by an electroluminescent material with improved oscillation efficiency of laser light and even reduced power consumption. The disclosed light-emitting device comprises a light-emitting element including a first electrode having a concave portion, an electroluminescent layer serving as a laser medium formed over the first electrode so as to be overlapped with the concave portion, and a second electrode formed over the electroluminescent layer so as to be overlapped with the concave portion, wherein light generated in the electroluminescent layer is resonated between the first electrode and the second electrode and emitted as laser light from the second electrode, an optical axis of the laser light intersects with the second electrode, the first electrode has a curved surface at the concave portion, and a center of curvature of the curved surface is located at the side of the second electrode above the first electrode.