A paper sheet processing apparatus comprising: a placing part configured to place paper sheets; a paper sheet feeding unit configured to feed the paper sheets placed on the placing part one by one into the apparatus; and a storing part (3a-3d; 4a, 4b) configured to store the paper sheets fed into the apparatus, wherein: the paper sheet feeding unit comprises feed rollers (23a-23d), gate rollers (35a-35d) disposed opposite to the feed rollers (23a-23d), respectively, biasing members (37a-37d) each independently biasing a corresponding gate roller of the gate rollers (35a-35d) in a direction of a corresponding feed roller of the feed rollers (23a-23d), and supporting members each supporting the corresponding gate roller of the gate rollers (35a-35d) and a corresponding biasing member of the biasing members (37a-37d), wherein each of the supporting members includes a support arm (32a-32d) that pivotally supports the corresponding gate roller of the gate rollers (35a-35d), each support arm (32a-32d) is coupled with the corresponding biasing member of the biasing members (37a-37d), each support arm (32a-32d) is pivotally supported by an arm shaft and is rotatable independently from other support arms, each of the gate rollers (35a-35d) is movable along a circumference of a circle around the arm shaft independently from other gate rollers, and the gate rollers (35a-35d) have gate roller shafts (34a-34d) respectively, and each of the gate rollers (35a-35d) is rotatable around an axis of a corresponding gate roller shaft of the gate roller shafts (34a-34d) independently from the other gate rollers. a placing part configured to place paper sheets; a paper sheet feeding unit configured to feed the paper sheets placed on the placing part one by one into the apparatus; and a storing part (3a-3d; 4a, 4b) configured to store the paper sheets fed into the apparatus, wherein: the paper sheet feeding unit comprises feed rollers (23a-23d), gate rollers (35a-35d) disposed opposite to the feed rollers (23a-23d), respectively, biasing members (37a-37d) each independently biasing a corresponding gate roller of the gate rollers (35a-35d) in a direction of a corresponding feed roller of the feed rollers (23a-23d), and supporting members each supporting the corresponding gate roller of the gate rollers (35a-35d) and a corresponding biasing member of the biasing members (37a-37d), wherein each of the supporting members includes a support arm (32a-32d) that pivotally supports the corresponding gate roller of the gate rollers (35a-35d), each support arm (32a-32d) is coupled with the corresponding biasing member of the biasing members (37a-37d), each support arm (32a-32d) is pivotally supported by an arm shaft and is rotatable independently from other support arms, each of the gate rollers (35a-35d) is movable along a circumference of a circle around the arm shaft independently from other gate rollers, and the gate rollers (35a-35d) have gate roller shafts (34a-34d) respectively, and each of the gate rollers (35a-35d) is rotatable around an axis of a corresponding gate roller shaft of the gate roller shafts (34a-34d) independently from the other gate rollers. the paper sheet feeding unit comprises feed rollers (23a-23d), gate rollers (35a-35d) disposed opposite to the feed rollers (23a-23d), respectively, biasing members (37a-37d) each independently biasing a corresponding gate roller of the gate rollers (35a-35d) in a direction of a corresponding feed roller of the feed rollers (23a-23d), and supporting members each supporting the corresponding gate roller of the gate rollers (35a-35d) and a corresponding biasing member of the biasing members (37a-37d), wherein feed rollers (23a-23d), gate rollers (35a-35d) disposed opposite to the feed rollers (23a-23d), respectively, biasing members (37a-37d) each independently biasing a corresponding gate roller of the gate rollers (35a-35d) in a direction of a corresponding feed roller of the feed rollers (23a-23d), and supporting members each supporting the corresponding gate roller of the gate rollers (35a-35d) and a corresponding biasing member of the biasing members (37a-37d), wherein each of the supporting members includes a support arm (32a-32d) that pivotally supports the corresponding gate roller of the gate rollers (35a-35d), each support arm (32a-32d) is coupled with the corresponding biasing member of the biasing members (37a-37d), each support arm (32a-32d) is pivotally supported by an arm shaft and is rotatable independently from other support arms, each of the gate rollers (35a-35d) is movable along a circumference of a circle around the arm shaft independently from other gate rollers, and the gate rollers (35a-35d) have gate roller shafts (34a-34d) respectively, and each of the gate rollers (35a-35d) is rotatable around an axis of a corresponding gate roller shaft of the gate roller shafts (34a-34d) independently from the other gate rollers.