An embodiment provides a lighting device and a lamp for an automobile including the same, the lighting device comprising: a light source module extending in a first direction; and a lens arranged on the light source module and extending in the first direction, wherein the light source module comprises a light guide member extending in the first direction, a light emitting element disposed on one side of the light guide member, and a reflection member disposed on a circumference surface of the light guide member, and the light guide member comprises a light emitting portion extending in the first direction.