A semiconductor light emitting device comprises: embedding resin; a first lead having a first inner lead section embedded in the embedding resin and a first outer lead section protruding from one side face of the embedding resin; a second lead having a second inner lead section embedded in the embedding resin and a second outer lead section protruding from a side face opposed to the one side face of the embedding resin; a semiconductor light emitting chip mounted on a portion of the first inner lead section exposed in a recess provided on an upper face of the embedding resin; and a wire connecting the semiconductor light emitting chip with the second lead. The first and second inner lead sections and the first and second outer lead sections each have a substantially coplanar rear face. At least a part of the rear face of the first inner lead section and at least a part of the rear face of the second inner lead section are not covered with the embedding resin but are exposed.