A semiconductor light-emitting device includes a base, a light-emitting element and a sealing resin. The base includes an obverse surface and a reverse surface spaced in a first direction, first side surfaces spaced in a second direction crossing the first direction, and second side surfaces spaced in a third direction crossing the first and second directions. The light-emitting element is on the base obverse surface. The sealing resin for covering the light-emitting element is smaller than the base in plan. The base has a wiring pattern connected to the light-emitting element and including an obverse surface electrode on the base obverse surface. The base also has a resist layer including a pattern-covering portion overlapping with the obverse surface electrode. The pattern-covering portion includes a resin outflow preventing portion, disposed outside the sealing resin in plan and extends continuously from one second side surface to the other.