A display device includes a light source, a light guide plate in which light emitted from the light source is incident on one surface and is emitted to the other surface, a bottom case configured to accommodate the light guide plate, a wavelength conversion unit between the light source and the light guide plate, a wavelength conversion unit holder disposed on the bottom case on an area corresponding to one end portion of the wavelength conversion unit, and a wave length conversion unit fixed to the wavelength conversion unit holder.