A honeycomb structure 100 includes porous partition walls 3 via which a plurality of cells 2 constituting through channels for a fluid are partitioned; and an outer peripheral wall positioned in the outermost periphery of the structure. Open frontal areas of predetermined cells 2 in an end face 11 of the structure on a fluid inlet side thereof and open frontal areas 5 of remaining cells 2 in an end face 12 of the structure on a fluid outlet side thereof are provided with plugged portions 5. Bubbles 6 are formed in the plurality of plugged portions 5, and the center of each of the bubbles 6 is positioned in a predetermined region 8 of each of the plugged portions 5 along the central axis direction thereof.