Abstract: A suppressor device for an ion chromatograph is provided between a separation column and a detector of an ion chromatograph. An electrodialysis suppressor includes a first flow path to which an eluent flowing from the separation column is supplied, a second flow path to which a regeneration liquid is supplied, an ion exchange membrane provided between the first flow path and the second flow path and an electrode to which a voltage is applied. A power supply circuit that applies a voltage to the electrode is turned off in a case in which an eluent is not supplied to the first flow path of the electrodialysis suppressor.