PURPOSE: To provide an exhaust gas purifying device by which the fusion damage of a filter owing to thermal expansion of an end face heater or defective regeneration can be prevented from occurring.

CONSTITUTION: An end face heater 4 is held peripherally displaceablly and axially non-displaceably by means of a holding guide part 5 the two ends of which are fixed to a can body 2. Thus, since when the end face heater 4 is energized to effect heating, the end face heater 4 is peripherally displaced but not axially displaced owing to thermal expansion, a distance between the end face heater 4 and the end face of a filter is maintained at an optimum value and a trouble, such as the fusion damage of the filter and the defective regeneration of the filter owing to axial displacement during thermal expansion of the end face heater 4, can be prevented from occurring.