A chromaticity variation correction method for correcting chromaticity variation of a plurality of light emitting units each including a light source that includes a plurality of light emitters having different emission colors, and a plurality of constant current elements that are respectively connected in series to a corresponding light emitter of the plurality of light emitters and respectively supply a constant current to the corresponding light emitter of the plurality of light emitters to cause the plurality of light emitters to respectively emit light when a control signal turns on a plurality of FETs respectively connected to the plurality of constant current elements , the chromaticity variation correction method comprising: setting all the constant current elements of all the light emitting units to a same constant current value; applying a same control signal to all the light emitting units , such that when the same constant current value and the same control signal is input to the plurality of light emitters of the plurality of light emitting units , all the plurality of light emitting units are expected to have a same target chromaticity coordinate (Pt); measuring a chromaticity (Pm1, Pm2, Pm3) of each of the plurality of light emitting units ; and when the measured chromaticity (Pm1, Pm2, Pm3) of at least one light emitting unit of the plurality of light emitting units differs from the target chromaticity coordinate (Pt), without adjusting the control signal, adjusting, in the at least one light emitting unit of the plurality of light emitting units , the constant current value of at least one constant current element of the plurality of constant current elements to be different from the constant current value of the other constant current elements of the plurality of constant current elements such that the chromaticity (Pm1, Pm2, Pm3) of the at least one light emitting unit of the plurality of light emitting units comes closer to the target chromaticity coordinate (Pt) as compared with the case in which all the constant current elements of all the plurality of light emitting units have the same constant current value. setting all the constant current elements of all the light emitting units to a same constant current value; applying a same control signal to all the light emitting units , such that when the same constant current value and the same control signal is input to the plurality of light emitters of the plurality of light emitting units , all the plurality of light emitting units are expected to have a same target chromaticity coordinate (Pt); measuring a chromaticity (Pm1, Pm2, Pm3) of each of the plurality of light emitting units ; and when the measured chromaticity (Pm1, Pm2, Pm3) of at least one light emitting unit of the plurality of light emitting units differs from the target chromaticity coordinate (Pt), without adjusting the control signal, adjusting, in the at least one light emitting unit of the plurality of light emitting units , the constant current value of at least one constant current element of the plurality of constant current elements to be different from the constant current value of the other constant current elements of the plurality of constant current elements such that the chromaticity (Pm1, Pm2, Pm3) of the at least one light emitting unit of the plurality of light emitting units comes closer to the target chromaticity coordinate (Pt) as compared with the case in which all the constant current elements of all the plurality of light emitting units have the same constant current value. <EOS>