A light emitting device includes a mounting board, a first light emitting element and a second light emitting element. The mounting board includes an insulator which includes a front face and a back face, a pair of front face wiring parts disposed on the front face of the insulator, a connection wiring part disposed on the front face of the insulator and spaced apart from the front face wiring parts, a pair of back face terminals disposed on the back face of the insulator, first interlayer wiring parts penetrating the insulator and electrically connecting the front face wiring parts and the back face terminals, and one or more second interlayer wiring parts embedded in the insulator to be in contact with the connection wiring part, and spaced apart from the back face terminals.