Exhaust Purification Device of Internal Combustion Engine

An exhaust purification device of an internal combustion engine arranging in an engine exhaust passage a main SOx trap catalyst able to trap SOx contained in an exhaust gas, dividing the exhaust passage downstream of the main SOx trap catalyst into a main exhaust passage and a bypass passage bypassing the main exhaust passage, arranging in the main exhaust passage an NOx storage catalyst storing NOx contained in the exhaust gas when an air-fuel ratio of an inflowing exhaust gas is lean and releasing stored NOx when the air-fuel ratio of the inflowing exhaust gas becomes a stoichiometric air-fuel ratio or rich, arranging in the main exhaust passage upstream of the NOx storage catalyst an auxiliary SOx trap catalyst, the exhaust gas is usually made to flow through the main exhaust passage, and the exhaust gas is made to flow through the bypass passage when the main SOx trap catalyst should be regenerated.