Lighting device, display device, and method of producing lighting device

A lighting device comprising:

• light sources arranged at intervals in a first direction;
• a light source substrate including a plate-shaped base including a mounting surface on which the light sources are mounted with solders;
• and
• a reflection sheet including:
• an insulating sheet made of an insulating material having a heat resistance higher than a melting temperature of the solders and an elastic modulus lower than that of the plate-shaped base of the light source substrate, the insulating sheet including first through holes in which the light sources are disposed;
• and
• a metal thin film having light reflectivity and being stacked on the insulating sheet, the metal thin film including:
• second through holes in which the light sources are disposed, the second through holes communicating with the first through holes, respectively;
• and
• slits each continuously extending in a second direction from a first edge of the metal thin film to a second edge of the metal thin film opposed to the first edge without breaks, the second direction perpendicular to the first direction, the slits being separated from each other in the first direction, each of the slits being disposed between adjacent two of the second through holes;
• wherein
• the light source substrate and the reflection sheet are bonded together with an adhesive layer.