A check processing device conveys checks into branch paths without the check jamming. The downstream end of the check transportation path 7 of the check processing device 1 is split by a diversion unit 18 into first and second branch paths 11 and 12. The diversion unit 18 has diversion unit guide surfaces 18a and 18b that diverge to the right and left, and a diversion unit top 18c that connects the top edges of the diversion unit guide surfaces 18a and 18b. A branch switching lever or flapper 19 is located at the branching position A. The diversion unit top 18c slopes upward from the lever top 19c in the diversion direction on both right and left sides, and also slopes upward from the top edges of the diversion unit guide surfaces 18a and 18b perpendicularly to the diversion direction. If a check 6 with a drooping top is advanced to the branching position A, the drooping portion is guided by the diversion unit top 18c up and over the diversion unit 18, thereby enabling the check 6 to enter the first or second branch path 11 or 12 without colliding with the diversion unit 18.