A semiconductor light emitting device can include a casing having a concave-shaped cavity with an opening, a semiconductor light emitting element installed in a bottom portion of the cavity, and a resin layer for filling an interior of the cavity. The resin layer can include a wavelength conversion material, and can be formed in a convex shape in a light radiation direction of the light emitting element. In the resin layer a layer with a high density of the wavelength conversion material can be formed near a surface of the convex shape.