A compaction management system for managing a compaction state of a compaction target ground, the compaction management system comprising: a work machine including a machine body, a work device attached to the machine body capably of vertically rotational movement, a work actuator capable of rotationally moving the work device hydraulically, a machine body posture detector that is configured to detect a machine body posture which is a posture of the machine body, a work device posture detector that is configured to detect a work device posture which is a posture of the work device, a working pressure detector that is configured to detect a working pressure of the work actuator, and a dimension storage device that is configured to store a work device dimension which is a dimension of the work device; a compaction-pressing-position calculation unit that is configured to calculate a compaction pressing position which is a position at which the work device is pressed against the compaction target ground, based on the machine body posture detected by the machine body posture detector, the work device posture detected by the work device posture detector, and the work device dimension stored in the dimension storage device, when the work device is pressed against the compaction target ground; a compaction-pressing-force calculation unit that is configured to calculate a compaction pressing force applied to the compaction target ground, based on the machine body posture detected by the machine body posture detector, the work device posture detected by the work device posture detector, the working pressure detected by the working pressure detector, and the work device dimension stored in the dimension storage device, when the work device is pressed against the compaction target ground; a compaction-pressing-record production unit that is configured to produce a plurality of compaction pressing records, each of which includes a combination of the compaction pressing position calculated by the compaction-pressing-position calculation unit and the compaction pressing force calculated by the compaction-pressing-force calculation unit and associated with the compaction pressing position; a storage device; a storage control unit that is configured to make the storage device store the plurality of compaction pressing records produced by the compaction-pressing-record production unit; and a final-compaction-pressing-record selection unit that is configured to select a selection target compaction pressing record including the largest compaction pressing force among a plurality of selection target compaction pressing records, which are included in the plurality of compaction pressing records stored in the storage device and produced with respect to the same compaction pressing position, as a final compaction pressing record with respect to the compaction pressing position. a work machine including a machine body, a work device attached to the machine body capably of vertically rotational movement, a work actuator capable of rotationally moving the work device hydraulically, a machine body posture detector that is configured to detect a machine body posture which is a posture of the machine body, a work device posture detector that is configured to detect a work device posture which is a posture of the work device, a working pressure detector that is configured to detect a working pressure of the work actuator, and a dimension storage device that is configured to store a work device dimension which is a dimension of the work device; a compaction-pressing-position calculation unit that is configured to calculate a compaction pressing position which is a position at which the work device is pressed against the compaction target ground, based on the machine body posture detected by the machine body posture detector, the work device posture detected by the work device posture detector, and the work device dimension stored in the dimension storage device, when the work device is pressed against the compaction target ground; a compaction-pressing-force calculation unit that is configured to calculate a compaction pressing force applied to the compaction target ground, based on the machine body posture detected by the machine body posture detector, the work device posture detected by the work device posture detector, the working pressure detected by the working pressure detector, and the work device dimension stored in the dimension storage device, when the work device is pressed against the compaction target ground; a compaction-pressing-record production unit that is configured to produce a plurality of compaction pressing records, each of which includes a combination of the compaction pressing position calculated by the compaction-pressing-position calculation unit and the compaction pressing force calculated by the compaction-pressing-force calculation unit and associated with the compaction pressing position; a storage device; a storage control unit that is configured to make the storage device store the plurality of compaction pressing records produced by the compaction-pressing-record production unit; and a final-compaction-pressing-record selection unit that is configured to select a selection target compaction pressing record including the largest compaction pressing force among a plurality of selection target compaction pressing records, which are included in the plurality of compaction pressing records stored in the storage device and produced with respect to the same compaction pressing position, as a final compaction pressing record with respect to the compaction pressing position.