A sheet storing apparatus, comprising: an inlet section configured to take in sheets from outside of the apparatus into the apparatus; a storing unit (7, 8) configured to mount a storage bag (21, 22) in a storing area (7a, 8a) of the storage unit (7, 8), the storage bag (21, 22) being for storing the sheets taken in into the apparatus; and a recognition unit configured to count the number of sheets to be stored in the storage bag (21, 22) mounted in the storing area (7a, 8a) of the storing unit (7, 8), wherein the storing unit (7, 8) includes: a holding section (34a, 34b) configured to hold the storage bag (21, 22) mounted in the storing area (7a, 8a) of the storing unit (7, 8); a support section (36a, 36b) configured to support the sheets stored in the storage bag (21, 22) from below via the storage bag (21, 22); a pressing section configured to press the sheets stored in the storage bag (21, 22); and a drive section (71,72,73,74,81,82,83,84) configured to move up and down the support section (36a, 36b) between an initial position and a final position and to move up and down the pressing section, characterized by further comprising a control section configured to control the drive section (71,72,73,74,81,82,83,84) so that the drive section (71,72,73,74,81,82,83,84) moves up and down the support section (36a, 36b) and moves up and down the pressing section based on the number of sheets counted by the recognition unit. an inlet section configured to take in sheets from outside of the apparatus into the apparatus; a storing unit (7, 8) configured to mount a storage bag (21, 22) in a storing area (7a, 8a) of the storage unit (7, 8), the storage bag (21, 22) being for storing the sheets taken in into the apparatus; and a recognition unit configured to count the number of sheets to be stored in the storage bag (21, 22) mounted in the storing area (7a, 8a) of the storing unit (7, 8), wherein the storing unit (7, 8) includes: a holding section (34a, 34b) configured to hold the storage bag (21, 22) mounted in the storing area (7a, 8a) of the storing unit (7, 8); a support section (36a, 36b) configured to support the sheets stored in the storage bag (21, 22) from below via the storage bag (21, 22); a pressing section configured to press the sheets stored in the storage bag (21, 22); and a drive section (71,72,73,74,81,82,83,84) configured to move up and down the support section (36a, 36b) between an initial position and a final position and to move up and down the pressing section, characterized by further comprising a holding section (34a, 34b) configured to hold the storage bag (21, 22) mounted in the storing area (7a, 8a) of the storing unit (7, 8); a support section (36a, 36b) configured to support the sheets stored in the storage bag (21, 22) from below via the storage bag (21, 22); a pressing section configured to press the sheets stored in the storage bag (21, 22); and a drive section (71,72,73,74,81,82,83,84) configured to move up and down the support section (36a, 36b) between an initial position and a final position and to move up and down the pressing section, characterized by further comprising a control section configured to control the drive section (71,72,73,74,81,82,83,84) so that the drive section (71,72,73,74,81,82,83,84) moves up and down the support section (36a, 36b) and moves up and down the pressing section based on the number of sheets counted by the recognition unit.