Isolator

An isolator includes: a chamber to be decontaminated including an inlet and an outlet provided with intake and discharge filters, respectively; first and second flow paths through which outside air is taken into the chamber and gas in the chamber is discharged via the intake and discharge filters, respectively; a first blower to take in the outside air to the chamber through the first flow path, and produce an air current to discharge the gas through the second flow path; a decontaminating-gas-supply unit to supply decontaminating gas into the chamber without flowing through the intake and discharge filters; a third flow path to connect the intake and discharge filters at an exterior of the chamber; and a second blower to produce an air current to circulate the gas through the intake and discharge filters and third flow path, when the decontaminating gas is supplied to the chamber.