A flash comprising a lighting device, the lighting device comprising: a substrate; three light emitting elements (51a, 51b, 51c) mounted on the substrate, each having an upper light emitting surface in rectangular shape and side light emitting surfaces in rectangular shape, the light emitting elements consisting of a first, second, and third light emitting elements (51a, 51b, 51c) configured to emit near-ultraviolet or blue light; and a fluorescent layer covering the light emitting elements, wherein one of the side light emitting surfaces of the first light emitting element is directed to face one of the side light emitting surfaces of the second light emitting element, with a light-gathering region, where the light emitting elements are not located, being interposed therebetween; the third light emitting element is disposed close to the first and second light emitting elements (51a, 51b); a first vertical side line forming a boundary between neighboring side light emitting surfaces of the first light emitting element is directed to face one of third vertical side lines forming boundaries between neighboring side light emitting surfaces of the third light emitting element; and a second vertical side line forming a boundary between neighboring side light emitting surfaces of the second light emitting element is directed to face another one of third vertical side lines forming boundaries between neighboring side light emitting surfaces of the third light emitting element, the light emitting elements being arranged such that light emitted from the side light emitting surfaces of the third light emitting element is not obstructed by the neighboring light emitting elements (51a, 51c), and wherein the fluorescent layer comprises a polymer and a rare earth complex wherein β-diketone and a phosphine oxide compound are coordinated to a rare earth atom. a substrate; three light emitting elements (51a, 51b, 51c) mounted on the substrate, each having an upper light emitting surface in rectangular shape and side light emitting surfaces in rectangular shape, the light emitting elements consisting of a first, second, and third light emitting elements (51a, 51b, 51c) configured to emit near-ultraviolet or blue light; and a fluorescent layer covering the light emitting elements, wherein one of the side light emitting surfaces of the first light emitting element is directed to face one of the side light emitting surfaces of the second light emitting element, with a light-gathering region, where the light emitting elements are not located, being interposed therebetween; the third light emitting element is disposed close to the first and second light emitting elements (51a, 51b); a first vertical side line forming a boundary between neighboring side light emitting surfaces of the first light emitting element is directed to face one of third vertical side lines forming boundaries between neighboring side light emitting surfaces of the third light emitting element; and a second vertical side line forming a boundary between neighboring side light emitting surfaces of the second light emitting element is directed to face another one of third vertical side lines forming boundaries between neighboring side light emitting surfaces of the third light emitting element, the light emitting elements being arranged such that light emitted from the side light emitting surfaces of the third light emitting element is not obstructed by the neighboring light emitting elements (51a, 51c), and wherein the fluorescent layer comprises a polymer and a rare earth complex wherein β-diketone and a phosphine oxide compound are coordinated to a rare earth atom.