There is provided a light source unit including a first light source, a second light source, a first heat sink for the first light source which is disposed to a side of the first light source, a second heat sink for the second light source which is disposed to a side of the second light source, and a first cooling fan which is disposed between the first heat sink and the second heat sink, wherein the first light source and the first heat sink are connected together by a first heat pipe via a bulkhead, and wherein the second light source and the second heat sink are connected together by a second heat pipe via the bulkhead.