Abstract: A bill processing machine according to the present invention includes a control portion that controls a pair of first and second sensor units. The control portion performs: a first process in which first and second reflected lights of one face of a bill are detected sequentially by first and second reflection sensors of the first sensor unit, respectively; a second process in which third and fourth reflected light of an other face of the bill are detected sequentially by first and second reflection sensors of the second sensor unit, respectively; and a third process in which first and second transmitted lights in one direction of the bill are detected by the first and second reflection sensors of the first sensor unit, respectively, and third and fourth transmitted lights in an other direction of the bill is detected by the first and second reflection sensor of the second sensor unit, respectively.

Abstract: A bill processing machine according to the present invention includes a control portion that controls a pair of first and second sensor units. The control portion performs: a first process in which first and second reflected lights of one face of a bill are detected sequentially by first and second reflection sensors of the first sensor unit, respectively; a second process in which third and fourth reflected light of an other face of the bill are detected sequentially by first and second reflection sensors of the second sensor unit, respectively; and a third process in which first and second transmitted lights in one direction of the bill are detected by the first and second reflection sensors of the first sensor unit, respectively, and third and fourth transmitted lights in an other direction of the bill is detected by the first and second reflection sensor of the second sensor unit, respectively.