Abstract: A semiconductor light emitting device is provided. The semiconductor light emitting device includes a semiconductor substrate having a first face on a first side, a second face on a second side opposite to the first face, and a third face which joins the first face and the second face. The semiconductor light emitting device further includes a first light reflection film in contact with at least a portion of the third face of the semiconductor substrate. The semiconductor device further includes a laminated body that is provided on the second side of the semiconductor substrate, and includes a first semiconductor layer, a second semiconductor layer, and a light emitting layer provided between the first semiconductor layer and the second semiconductor layer.