A laser diode which can be easily assembled at low material cost is provided. A first light emitting device having a laser structure on a substrate, a second light emitting device having laser structures on a substrate, and a support base are provided. The first light emitting device and the second light emitting device are layered in this order on the support base in a manner that the respective laser structures of the first light emitting device and the second light emitting device are opposed to each other. A substrate side of the first light emitting device and a laser structure side of the second light emitting device are electrically connected to the support base.