To automatically and easily remove a residual on a conveyance path in a short period of time without opening the conveyance path, and to suppress a trouble such as keeping a user waiting or the like.

A residue removing card 11 is inserted from a card insertion/ejection port 2 into a conveyance path 3, with a bent part 11a of a front end side in a card conveyance direction directed downward, and the residue removing card 11 is conveyed toward the rear end part 4 side of the conveyance path 3 by conveyance rollers 5a-5c so that a transaction card 10 remaining on the conveyance path 3 is extruded from the rear end part 4 of the conveyance path 3.