LIGHT-EMITTING DEVICE

To achieve a compact light-emitting device.SOLUTION: A light-emitting device comprises: a substrate that has a top face; a plurality of sub-mounts that have first side faces and second side faces being side faces on the opposite side of the first side faces, and have the first side faces arranged side by side in a first direction on the top face of the substrate, in which their length in the first direction is smaller than their length in a second direction perpendicular to the first direction in top view; a plurality of semiconductor laser elements that individually have light emission surfaces, in which the light emission surfaces are arranged on the sub-mounts different from each other at positions closer to the first side faces than the second side faces; and a plurality of protection elements that are arranged on the sub-mounts different from each other at positions where the distance to the second faces is shorter than the distance from the semiconductor laser elements to the second faces.SELECTED DRAWING: Figure 4 【課題】 小型の発光装置を実現できる。【解決手段】 上面を有する基体と、第１側面と第１側面の反対側の側面である第２側面とを有し、基体の上面において第１側面が第１方向に並べて配置され、第１方向の長さよりも上面視で第１方向に垂直な第２方向の長さの方が大きい、複数のサブマウントと、それぞれが、光出射面を有し、光出射面が第２側面よりも第１側面に近い位置で、互いに異なるサブマウントに配置される、複数の半導体レーザ素子と、それぞれが、第２側面までの距離が、半導体レーザ素子から第２側面までの距離よりも短い位置で、互いに異なるサブマウントに配置される、複数の保護素子と、を備える、発光装置。【選択図】 図４