<p>Disclosed is a sensor for exhaust purification use which can realize gripping of an inspection filter with moderate operating stress while appropriately measuring the PM amount or the PM concentration, said sensor provided with an inspection filter which is provided on a secondary exhaust line bifurcated from the primary exhaust line of an internal-combustion engine; and a gripping member which grips the inspection filter onto the secondary exhaust line; wherein the gripping member grips the inspection filter such that 10 to 50% of the area in the outer periphery of the inspection filter is covered from the outer periphery side.</p>
