In a lighting apparatus including an emission unit and a constant current control part and/or a constant voltage control part for controlling a light quantity of the emission unit on the basis of a control signal, the constant current control part and/or the constant voltage control part includes light quantity control means for controlling the light quantity by changing the magnitude of a current and/or a voltage to be supplied to the emission unit in accordance with the control signal. Since no switching element is used in dimming level control of the emission unit, noise derived from an on/off operation of a switching element is not caused, and hence, noise may be reduced.