An imaging system, comprising: a plurality of imaging devices which are mounted on a same moving body, and configured to capture images of subjects; and a controller configured to calculate a common target white balance value to the images acquired by the imaging devices, wherein each of the plurality of imaging devices comprises: a white balance calculator configured to calculate an individual white balance value of an image acquired by the imaging device; and a white balance corrector configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value, and the controller comprises: a weighting unit configured to individually weight the individual white balance value given from each of the plurality of imaging devices, based on a weighting coefficient set for each of the plurality of imaging devices, and an average calculator configured to calculate the average of the weighted individual white balance values, and to set the target white balance value to the calculated average, wherein the controller includes a correction speed calculator configured to calculate a correction speed of each imaging device at which the imaging device corrects the individual white balance value to the target white balance value, so that all the individual white balance values are corrected to the target white balance value at the same time, and the white balance corrector is configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value based on the correction speed calculated by the correction speed calculator. a plurality of imaging devices which are mounted on a same moving body, and configured to capture images of subjects; and a controller configured to calculate a common target white balance value to the images acquired by the imaging devices, wherein each of the plurality of imaging devices comprises: a white balance calculator configured to calculate an individual white balance value of an image acquired by the imaging device; and a white balance corrector configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value, and a white balance calculator configured to calculate an individual white balance value of an image acquired by the imaging device; and a white balance corrector configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value, and the controller comprises: a weighting unit configured to individually weight the individual white balance value given from each of the plurality of imaging devices, based on a weighting coefficient set for each of the plurality of imaging devices, and an average calculator configured to calculate the average of the weighted individual white balance values, and to set the target white balance value to the calculated average, wherein the controller includes a correction speed calculator configured to calculate a correction speed of each imaging device at which the imaging device corrects the individual white balance value to the target white balance value, so that all the individual white balance values are corrected to the target white balance value at the same time, and the white balance corrector is configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value based on the correction speed calculated by the correction speed calculator. a weighting unit configured to individually weight the individual white balance value given from each of the plurality of imaging devices, based on a weighting coefficient set for each of the plurality of imaging devices, and an average calculator configured to calculate the average of the weighted individual white balance values, and to set the target white balance value to the calculated average, wherein the controller includes a correction speed calculator configured to calculate a correction speed of each imaging device at which the imaging device corrects the individual white balance value to the target white balance value, so that all the individual white balance values are corrected to the target white balance value at the same time, and the white balance corrector is configured to correct the individual white balance value of the image of the subject taken by the imaging device to the target white balance value based on the correction speed calculated by the correction speed calculator.