<p>A honeycomb structure comprising a columnar honeycomb unit having multiple cells extending from a first end face to a second end face partitioned by a cell wall along its longitudinal direction, the honeycomb unit containing zeolite and an inorganic binder, and comprising a coat layer provided on its outer circumferential surface, characterized in that the radial thermal expansion coefficient (?c) and radial Young's modulus (Ec) of the coat layer and the radial thermal expansion coefficient (?h) and radial Young's modulus (Eh) of the honeycomb unit satisfy the relationships: 0.75=?c/?h=1.25 (1) and 0.75=Ec/Eh=1.25 (2).</p>
