A color conversion element includes: a substrate; a fluorescent part which is arranged above the substrate, receives laser light from an outside, and emits light of a color different from a color of the laser light; a first flattening layer which is superposed on a first main surface of the fluorescent part opposite to the substrate; a second flattening layer which is superposed on a second main surface of the fluorescent part facing the substrate; a reflective layer which is superposed on a main surface of the second flattening layer facing the substrate and formed of a dielectric multilayer film; and a joint part which lies between the reflective layer and the substrate and joins together the reflective layer and the substrate.