Provided is a card insertion and ejection mechanism to be mounted forward of a card reader structured to convey a card so that a longitudinal direction of the card is coincided with a conveying direction of the card, the card insertion and ejection mechanism being capable of preventing skimming and capable of sending into the card reader the card in an orientation capable of being processed by the card reader even when the card is inserted into the card insertion and ejection mechanism in any orientation. A card insertion and ejection mechanism takes in a card to a turning position when the card is inserted into a card insertion port with front and rear sides of the card directed correctly so that a short widthwise direction of the card is coincided with an “X” direction, and controls a card turning and conveying mechanism in a turning direction and at a turning angle based on a result of determination as to an orientation of the inserted card, to turn the card. The card insertion and ejection mechanism does not take in the card when the card is inserted into the card insertion port so that a longitudinal direction of the card is coincided with the “X” direction or when the card is inserted into the card insertion port with the front and rear sides of the card directed oppositely.