Light-emitting element and display device, and method for manufacturing same

A red-light-emitting diode comprising: a plurality of light-emitting layers, each of which emits red light; and a plurality of P and N layers joined to the light-emitting layers so that the light-emitting layers emit red light when a voltage is applied. The plurality of light-emitting layers and the plurality of P and N layers are sequentially lined up in direction T and joined. When manufacturing an image display device using the red-light-emitting diodes, the red-light-emitting diodes are scattered on the upper surface of a guide member placed on the upper surface of a substrate. The invention makes it possible to efficiently arrange light-emitting elements and manufacture an image display device.