A paper leaves processor configured to store paper leaves by sandwiching each paper leaf between a pair of films and taking-up the films by a take-up roller (la), comprising: a sensor configured to detect a position of each paper leaf in a direction of a width of the take-up roller (la) which is orthogonal to a direction of taking up the films, when the paper leaf is moved on a conveying path for conveying the paper leaves, wherein the conveying path extends between the take-up roller (la) and an inlet-outlet opening for the paper leaves; a correction amount-calculating unit configured to be operable, when storing paper leaves on the take-up roller (la), to: calculate a protrusion amount by which each paper leaf protrudes from a predetermined area set in advance with respect to the inlet-outlet opening by comparing the position of the paper leaf detected by said sensor and the predetermined area; determine a movement amount of the take-up roller (la) by calculating a correction amount for accommodating the paper leaf within the predetermined area based on the protrusion amount, and a moving direction of the take-up roller (la); and form correction information by associating the movement amount of the take-up roller with a storage order of the paper leaf; a correction information-storing unit configured to store the correction information; a moving unit configured to move the take-up roller (la) in the direction of the width of the take-up roller (la); and a position control unit configured to be operable, when discharging paper leaves stored on the take-up roller (la), to read out the correction information from the correction information-storing unit, extract the movement amount of the take-up roller (la) which is associated with a paper leaf to be discharged next, based on the storage order, and control said moving unit based on the movement amount to thereby cause a discharge position of the paper leaf to be accommodated within the predetermined area. a sensor configured to detect a position of each paper leaf in a direction of a width of the take-up roller (la) which is orthogonal to a direction of taking up the films, when the paper leaf is moved on a conveying path for conveying the paper leaves, wherein the conveying path extends between the take-up roller (la) and an inlet-outlet opening for the paper leaves; a correction amount-calculating unit configured to be operable, when storing paper leaves on the take-up roller (la), to: calculate a protrusion amount by which each paper leaf protrudes from a predetermined area set in advance with respect to the inlet-outlet opening by comparing the position of the paper leaf detected by said sensor and the predetermined area; determine a movement amount of the take-up roller (la) by calculating a correction amount for accommodating the paper leaf within the predetermined area based on the protrusion amount, and a moving direction of the take-up roller (la); and form correction information by associating the movement amount of the take-up roller with a storage order of the paper leaf; calculate a protrusion amount by which each paper leaf protrudes from a predetermined area set in advance with respect to the inlet-outlet opening by comparing the position of the paper leaf detected by said sensor and the predetermined area; determine a movement amount of the take-up roller (la) by calculating a correction amount for accommodating the paper leaf within the predetermined area based on the protrusion amount, and a moving direction of the take-up roller (la); and form correction information by associating the movement amount of the take-up roller with a storage order of the paper leaf; a correction information-storing unit configured to store the correction information; a moving unit configured to move the take-up roller (la) in the direction of the width of the take-up roller (la); and a position control unit configured to be operable, when discharging paper leaves stored on the take-up roller (la), to read out the correction information from the correction information-storing unit, extract the movement amount of the take-up roller (la) which is associated with a paper leaf to be discharged next, based on the storage order, and control said moving unit based on the movement amount to thereby cause a discharge position of the paper leaf to be accommodated within the predetermined area.