A card reader may include a card conveying passage; and a card conveying mechanism. The card conveying mechanism may include a motor; a conveying roller; and a power transmission mechanism. The power transmission mechanism may include a first gear, a second gear, a third gear, a fourth gear, a first support shaft structured to support the first gear and the third gear in a rotatable manner; and a second support shaft structured to support the second gear and the fourth gear in a rotatable manner. An axial direction of the first support shaft coincides with the first direction, and an axial direction of the second support shaft coincides with the first direction. The first gear and third gear overlap each other in the axial direction of the first support shaft, and the second gear and fourth gear overlap each other in the axial direction of the second support shaft.