A carbon dioxide electrolytic device (1, 1X), comprising: an electrolysis cell (2,2X) including a cathode configured to reduce a first substance containing carbon dioxide and thus produce a first product containing a carbon compound, an anode configured to oxidize a second substance containing water or hydroxide ions and thus produce a second product containing oxygen, a cathode flow path facing the cathode, an anode flow path facing the anode, and a separator separating the anode and the cathode; a carbon dioxide source configured to supply the carbon dioxide to the cathode flow path; a solution source to supply an electrolytic solution containing water to the anode flow path; at least one sensor (71, 72, 73, 74, 75, 76) configured to acquire at least one data selected from the group consisting of a data indicating a discharge amount per unit time of a liquid containing water to be discharged from at least one flow path selected from the group consisting of the anode and cathode flow paths and a data indicating a concentration of at least one ion selected from the group consisting of ions in the liquid; a power controller configured to apply a voltage between the anode and the cathode; a refresh material source including a gas source configured to supply a gaseous substance to the at least one flow path; and a controller configured to to stop the supply of the carbon dioxide and the electrolytic solution, and start the supply of the gaseous substance from the refresh material source to the at least one flow path, in accordance with the at least one data. an electrolysis cell (2,2X) including a cathode configured to reduce a first substance containing carbon dioxide and thus produce a first product containing a carbon compound, an anode configured to oxidize a second substance containing water or hydroxide ions and thus produce a second product containing oxygen, a cathode flow path facing the cathode, an anode flow path facing the anode, and a separator separating the anode and the cathode; a cathode configured to reduce a first substance containing carbon dioxide and thus produce a first product containing a carbon compound, an anode configured to oxidize a second substance containing water or hydroxide ions and thus produce a second product containing oxygen, a cathode flow path facing the cathode, an anode flow path facing the anode, and a separator separating the anode and the cathode; a carbon dioxide source configured to supply the carbon dioxide to the cathode flow path; a solution source to supply an electrolytic solution containing water to the anode flow path; at least one sensor (71, 72, 73, 74, 75, 76) configured to acquire at least one data selected from the group consisting of a data indicating a discharge amount per unit time of a liquid containing water to be discharged from at least one flow path selected from the group consisting of the anode and cathode flow paths and a data indicating a concentration of at least one ion selected from the group consisting of ions in the liquid; a power controller configured to apply a voltage between the anode and the cathode; a refresh material source including a gas source configured to supply a gaseous substance to the at least one flow path; and a controller configured to to stop the supply of the carbon dioxide and the electrolytic solution, and start the supply of the gaseous substance from the refresh material source to the at least one flow path, in accordance with the at least one data.