Paper-money deposition processing mechanism

A paper-money deposition processing mechanism is provided, which can detect a folded paper-money that is deemed unsuitable to be put into a device for deposition when the paper money is being fed into the device. The paper-money deposition processing mechanism includes an access port 2, which receives the paper-money P; and a feeding roller 15, which feeds the paper-money P from the access port 2 through a forward rotation and sends the paper-money P back to the access port 2 through a reverse rotation. Between the transport faces 19a and 19b corresponding to each other, a pair of transport guiders 18 that guides the paper-money P fed from the access port 2 is installed. On the transport faces 19a and 19b at the downstream of the feeding roller 15 of the transport guider 18, a protrusion section 23 that protrudes from the transport faces 19a and 19b is installed. At the downstream of the protrusion section 23, an arrival-detection sensor 26 that detects a front end of the transported paper-money P is installe