To continue a series of cell treatments even in a case where a treatment has become impossible in any isolator, a cell treatment system is provided with at least two isolators that perform different treatments, such that a sequential series of cell treatments is performed in each of the isolators. The cell treatment system is provided with a first isolator that performs a first treatment, a second isolator that performs a second treatment different from the first treatment, and a common isolator capable of performing the first treatment and the second treatment.