A lighting device 12 includes: an LED 13; an LED substrate 14 at least having an LED mounting portion 22 on which a surface of the LED 13 adjacent to a light-emitting surface 13a of the LED 13 is mounted and a first extension portion 23 extending from the LED mounting port on 22 toward a side opposite to the light-emitting surface 13a; and an LED supporting member 18 at least including an LED supporting portion 25 and a substrate contact portion 27. The LED supporting portion 25 is disposed on an opposite side from the LED substrate 14 with respect to the LED 13 and supports the LED 13 and the substrate contact portion 27 extends along a plate surface of the LED substrate 14 and is in contact with at least a part of the first extension portion 23.