Provided is a cash transaction machine including a temporary stack portion. The cash transaction machine includes: a carriage receiving a paper medium stacked in the temporary stack portion; a driving belt transferring the carriage to a medium outlet; a pressing belt pressing the paper medium being transferred by the carriage in interoperation with the driving belt; a plurality of guide rollers being provided along a travel path of the carriage to define a travel path of the driving belt and a travel path of the pressing belt; and a one-way clutch adjusting an interoperating state between the driving belt and the pressing belt to prevent a friction from occurring between the pressing belt and the paper medium while the paper medium is being loaded to the carriage.