A card conveyor device comprises a card guide path the transport means being spaced by a distance less than the length of the card, along which a card for reading or writing information therein is guided in a predetermined direction, first and second transport means adapted to engage the card to thereby move the same along the card guide path, drive means for the card transport means, detector means for detecting the position of the card on the guide path, and control means effective to bring the card transport means into or out of engagement with the card as determined by a signal from the detector means.