disclosed is a concentrator solar cell which guides concentrated sunlight to a solar cell . the concentrator solar cell has : a substrate which has a solar cell mounted thereon ; a light guide member which is positioned in the top part of the solar cell in such a way that the lower end surface thereof faces the solar cell ; and a support member which is provided across the upper part of the light guide member and is provided in a standing state on the substrate . the concentrator solar cell is a hermetically sealed structure due to the substrate , the light guide member , and the support member .