Genetically modified cell production system

According to the present invention, a genetically modified cell can be mass-produced efficiently. A genetically modified cell production system 1 includes: a cell-processing isolator 6 for seeding a T cell in a well plate (culture vessel); a cell culture incubator 14 (cell storage) for accommodating the culture vessel in which the T cell was seeded and culturing the T cell; a virus-processing isolator 5 (nucleic acid preparation isolator) for providing, to the well plate, a virus having a nucleic acid containing a gene to be introduced into a cell; a virus storage 13 (nucleic acid storage) for accommodating the well plate from the virus-processing isolator 5; and a virus infection isolator 6 (nucleic acid introduction isolator) for introducing the nucleic acid to the T cell by infecting the T cell with the virus.