Card reader and card pulling-out detection method

A card pulling-out detection method executed in a card reader which comprises an insertion slot into which a card is inserted, an insertion detection sensor which detects that the card has been inserted into the insertion slot, a conveyance path where the card inserted through the insertion slot is conveyed, a conveyance part which comprises a drive part and conveys the card in an inside of the conveyance path, and a conveyance detection sensor which detects the card which is conveyed along the conveyance path, the card pulling-out detection method comprising:

• in the card reader,
• causing the drive part to rotate in a first direction only for a specific time in a case that the conveyance detection sensor is turned from “OFF” to “ON” and then to “OFF” in a state that the insertion detection sensor is “ON”;
• then, causing the drive part to rotate in a second direction only for a specific time, and
• determining that the card is being pulled out during insertion in a case that a load when the drive part is rotated in a direction that the card is moved toward the insertion slot is smaller than a load when the drive part is rotated in a reverse direction.