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.

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.

A magnetic recording medium processing device may include a medium conveying passage; a magnetic head disposed to face the medium conveying passage from a first direction side and structured to perform at least one of reading of magnetic data recorded in the magnetic recording medium and recording of magnetic data to the magnetic recording medium; a conveying roller structured to contact with the magnetic recording medium from a second direction side to convey the magnetic recording medium; a rotation shaft to which the conveying roller is fixed; a drive mechanism structured to rotate the rotation shaft; and a counter roller disposed on a second direction side of the magnetic head so as to oppose the magnetic head. The counter roller may be rotatably held by the rotation shaft.

A magnetic recording medium processing device may include a medium conveying passage; a magnetic head disposed to face the medium conveying passage from a first direction side and structured to perform at least one of reading of magnetic data recorded in the magnetic recording medium and recording of magnetic data to the magnetic recording medium; a conveying roller structured to contact with the magnetic recording medium from a second direction side to convey the magnetic recording medium; a rotation shaft to which the conveying roller is fixed; a drive mechanism structured to rotate the rotation shaft; and a counter roller disposed on a second direction side of the magnetic head so as to oppose the magnetic head. The counter roller may be rotatably held by the rotation shaft.

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.

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.