PROBLEM TO BE SOLVED: To provide a structure of a lighting unit which can connect an electronic component for surface mounting with one kind of a bus bar and moreover suppressing enlargement of the unit while color temperature is made changeable, and hardly causing emission unevenness.SOLUTION: There are provided: three of a first bus bar 19, a second bus bar 19, and a third bus bar 19 of the same shape on which a pair of separated right and left contact spring pieces 35 are formed and which are inserted in a housing 17 and arranged parallel in a separation direction; a first semiconductor light emitting element 21 to be connected to the pair of the right and left contact spring pieces 35 adjacent to the first bus bar 19 and the second bus bar 19; a second semiconductor light emitting element 23 which is connected to the pair of the right and left contact spring pieces 35 adjacent to the second bus bar 19 and the third bus bar 19 and emits light in a color temperature different from the first semiconductor light emitting element 21; and a cover 13 inside which the housing 17 is inserted and which is provided with a lens 25 through which emission light from the first semiconductor light emitting element 21 and the second semiconductor light emitting element 23 is transmitted.