A card reader for use with a card formed in a substantially rectangular shape which is conveyed in its short widthwise direction and is processed, comprising: a card conveying mechanism structured to convey the card, a conveying passage where the card is conveyed, a magnetic head structured to abut with a magnetic stripe formed on one face of the card in parallel with a longitudinal direction of the card for performing at least one of reading of magnetic data recorded on the card and recording of magnetic data on the card; and a head moving mechanism structured to move the magnetic head in a widthwise direction of the conveying passage which is perpendicular to a conveying direction of the card and to move the magnetic head between a head abutting position where the magnetic head is capable of abutting with the magnetic stripe and a head retreated position where the magnetic head is retreated from the conveying passage; characterized in that an opposite member which is formed with an opposed face for abutting the magnetic head located at the head abutting position with the magnetic stripe at a predetermined abutting pressure, wherein the card conveying mechanism comprises a first conveying roller, which is disposed on a front side relative to the magnetic head in the taking-in direction of the card for contacting with the card and conveying the card, and a second conveying roller which is disposed on a rear side relative to the magnetic head in the taking-in direction of the card for contacting with the card and conveying the card; and wherein when a direction perpendicular to the conveying direction of the card and the widthwise direction of the conveying passage is referred to as a height direction of the conveying passage, the opposite member is disposed on one side of the conveying passage in the height direction of the conveying passage, and the second conveying roller is disposed so that a contact position of the second conveying roller with the card is located on the other side in the height direction of the conveying passage with respect to a contact position of the first conveying roller with the card. a card conveying mechanism structured to convey the card, a conveying passage where the card is conveyed, a magnetic head structured to abut with a magnetic stripe formed on one face of the card in parallel with a longitudinal direction of the card for performing at least one of reading of magnetic data recorded on the card and recording of magnetic data on the card; and a head moving mechanism structured to move the magnetic head in a widthwise direction of the conveying passage which is perpendicular to a conveying direction of the card and to move the magnetic head between a head abutting position where the magnetic head is capable of abutting with the magnetic stripe and a head retreated position where the magnetic head is retreated from the conveying passage; characterized in that an opposite member which is formed with an opposed face for abutting the magnetic head located at the head abutting position with the magnetic stripe at a predetermined abutting pressure, wherein the card conveying mechanism comprises a first conveying roller, which is disposed on a front side relative to the magnetic head in the taking-in direction of the card for contacting with the card and conveying the card, and a second conveying roller which is disposed on a rear side relative to the magnetic head in the taking-in direction of the card for contacting with the card and conveying the card; and wherein when a direction perpendicular to the conveying direction of the card and the widthwise direction of the conveying passage is referred to as a height direction of the conveying passage, the opposite member is disposed on one side of the conveying passage in the height direction of the conveying passage, and the second conveying roller is disposed so that a contact position of the second conveying roller with the card is located on the other side in the height direction of the conveying passage with respect to a contact position of the first conveying roller with the card.