A work management system, comprising: one or a plurality of fastening members having each a first IC tag; a component (178, 179) having a component identifier (137,165, 176, 177) accommodating a second IC tag; the first IC tag having information based on tightening/loosening information which is information relating to tightening/loosening when the component having second IC tag is tightened or loosened by tightening/loosening the fastening member and information relating to the component; an information acquisition part which is configured to acquire information indicated by the first IC tag; a determination part which is configured to determine whether first combination information combining information indicated by the first IC tag and acquired by the information acquisition part with information indicated by the second IC tag is correct, a comparison part which is configured to compare the first combination information with second combination information which is set in advance regarding the attachment/detachment of the component by the fastening member, when the information acquisition part acquires the second combination information, characterized in that the second combination information is based on design information described in a design drawing or work information described in a work instruction, the tightening/loosening information contains tightened/loosened time information when the one or the plurality of the fastening members are tightened/loosened, the comparison part is configured to determine the oldest tightened/loosened time information among the tightened/loosened time information as a start time of predetermined work for tightening/loosening the component, and compare the start time of predetermined work with predetermined work start time information which is contained in the work information, and an output part is configured to output information regarding progress of the predetermined work based on the determination result of the determination part and on the comparison result of the comparison part. one or a plurality of fastening members having each a first IC tag; a component (178, 179) having a component identifier (137,165, 176, 177) accommodating a second IC tag; the first IC tag having information based on tightening/loosening information which is information relating to tightening/loosening when the component having second IC tag is tightened or loosened by tightening/loosening the fastening member and information relating to the component; an information acquisition part which is configured to acquire information indicated by the first IC tag; a determination part which is configured to determine whether first combination information combining information indicated by the first IC tag and acquired by the information acquisition part with information indicated by the second IC tag is correct, a comparison part which is configured to compare the first combination information with second combination information which is set in advance regarding the attachment/detachment of the component by the fastening member, when the information acquisition part acquires the second combination information, characterized in that the second combination information is based on design information described in a design drawing or work information described in a work instruction, the tightening/loosening information contains tightened/loosened time information when the one or the plurality of the fastening members are tightened/loosened, the comparison part is configured to determine the oldest tightened/loosened time information among the tightened/loosened time information as a start time of predetermined work for tightening/loosening the component, and compare the start time of predetermined work with predetermined work start time information which is contained in the work information, and an output part is configured to output information regarding progress of the predetermined work based on the determination result of the determination part and on the comparison result of the comparison part.