An illumination apparatus including a first light emitting device, a first phosphor layer, a second light emitting device and a second phosphor layer and a beam combining element is provided. The first light emitting device is capable of providing a first light beam and the first phosphor layer is disposed on the transmission path of the first light beam. The second light emitting device is disposed opposite to the first light emitting device and for providing a second light beam, wherein the second phosphor layer is disposed on the transmission path of the second light beam. The beam combining element is disposed between the first phosphor layer and the second phosphor layer. In addition, the invention also provides a projection apparatus.