A paper sheet storage cassette that is portable, the paper sheet storage cassette comprising: an inlet (43; 73), provided in the paper sheet storage cassette (42; 72), through which a paper sheet is inserted into the paper sheet storage cassette (42; 72) from the outside; a stacking unit (46; 76), provided inside the paper sheet storage cassette (42; 72), on which paper sheets inserted through the inlet (43; 73) into the paper sheet storage cassette (42; 72) from the outside are stacked in a layered state, the stacking unit (46; 76) configured to move along a direction in which the paper sheets are stacked; and a stacking wheel (44; 74) configured to send paper sheets inserted through the inlet (43; 73) into the paper sheet storage cassette (42; 72) from the outside, one by one, to the stacking unit (46; 76), the stacking wheel (44; 74) including a base body that rotates about a shaft, and a plurality of blades which extend outward from an outer circumferential surface of the base body in a direction opposite to a direction of rotation of the base body, the stacking wheel (44; 74) configured to send paper sheets stored between the blades into the stacking unit (46; 76), and a paper sheet passing space (48; 78) through which paper sheets to be sent into the stacking unit (46; 76) by the stacking wheel (44; 74) pass, the paper sheet passing space (48; 78) being formed near the stacking wheel (44; 74) inside the paper sheet storage cassette (42; 72); wherein there is provided an inhibiting portion (50, 52, 54; 80) configured to inhibit a paper sheet stacked on the stacking unit (46; 76) from being moved toward an upper portion of the paper sheet passing space (48; 78), and the inhibiting portion (50, 52, 54; 80) has one or more groove portions (50a, 52a, 54a; 80a) formed in an inner wall of the paper sheet storage cassette, the inner wall facing the stacking wheel and an inner wall in which the inlet is provided and at least a part of each of the one or more groove portions (50a, 52a, 54a; 80a) form a stepped shape that inhibits an edge of the paper sheet stacked on the stacking unit (46; 76) from being moved in a direction toward the paper sheet passing space (48; 78) when the paper sheet storage cassette (42; 72) is transported, wherein an edge of a paper sheet can be caught by the stepped shape when the paper sheet stacked on the stacking unit (46; 76) is moved toward the upper portion of the paper sheet passing space (48; 78). an inlet (43; 73), provided in the paper sheet storage cassette (42; 72), through which a paper sheet is inserted into the paper sheet storage cassette (42; 72) from the outside; a stacking unit (46; 76), provided inside the paper sheet storage cassette (42; 72), on which paper sheets inserted through the inlet (43; 73) into the paper sheet storage cassette (42; 72) from the outside are stacked in a layered state, the stacking unit (46; 76) configured to move along a direction in which the paper sheets are stacked; and a stacking wheel (44; 74) configured to send paper sheets inserted through the inlet (43; 73) into the paper sheet storage cassette (42; 72) from the outside, one by one, to the stacking unit (46; 76), the stacking wheel (44; 74) including a base body that rotates about a shaft, and a plurality of blades which extend outward from an outer circumferential surface of the base body in a direction opposite to a direction of rotation of the base body, the stacking wheel (44; 74) configured to send paper sheets stored between the blades into the stacking unit (46; 76), and a paper sheet passing space (48; 78) through which paper sheets to be sent into the stacking unit (46; 76) by the stacking wheel (44; 74) pass, the paper sheet passing space (48; 78) being formed near the stacking wheel (44; 74) inside the paper sheet storage cassette (42; 72); wherein there is provided an inhibiting portion (50, 52, 54; 80) configured to inhibit a paper sheet stacked on the stacking unit (46; 76) from being moved toward an upper portion of the paper sheet passing space (48; 78), and the inhibiting portion (50, 52, 54; 80) has one or more groove portions (50a, 52a, 54a; 80a) formed in an inner wall of the paper sheet storage cassette, the inner wall facing the stacking wheel and an inner wall in which the inlet is provided and at least a part of each of the one or more groove portions (50a, 52a, 54a; 80a) form a stepped shape that inhibits an edge of the paper sheet stacked on the stacking unit (46; 76) from being moved in a direction toward the paper sheet passing space (48; 78) when the paper sheet storage cassette (42; 72) is transported, wherein an edge of a paper sheet can be caught by the stepped shape when the paper sheet stacked on the stacking unit (46; 76) is moved toward the upper portion of the paper sheet passing space (48; 78).