IN-VEHICLE LIGHTING DEVICE

An in-vehicle lighting device includes: a panel that has a front surface and a back surface, and has a through-hole penetrating through the front surface and the back surface; a light source disposed on a side of the back surface of the panel; and a button inserted in the through-hole, the button including a front end part protruding from the front surface, an first intermediate part provided continuously with the front end part and located between the front surface and the back surface of the panel, a surface of the first intermediate part containing a material that reflects light emitted from the light source, and a back end part provided continuously with the first intermediate part and protrudes from the back surface.