An automatic transaction apparatus includes a card insert port into which a card medium is inserted; a paper medium discharge section that has a discharge port from which a paper medium is discharged; and a conveying path that has a lower guide surface and an upper guide surface that guide conveyance of the paper medium and discharge of the paper medium from the discharge port, a dimension of the conveying path in a thickness direction of the paper medium being smaller than a thickness of the card medium at least at one position of the conveying path along a conveying direction.