A lighting unit and rail type lighting device according to an embodiment of the present invention includes a body part having a body plate and a first guide part disposed on the top of the body plate in a lengthwise direction of the body plate, a magnet material accommodation part disposed at an upper portion of the body part to accommodate a magnet material magnetically coupled with a rail unit; and a body-coupling part that is slide-coupled to each of both ends of the body part along the first guide part.