A honeycomb unit for exhaust emission control, comprising: a metal outer tube; and a metal honeycomb structure pressed into and joined to the metal outer tube, the metal honeycomb structure including: a joining strip joined to the metal outer tube; a planar sheet; a corrugated sheet placed on the planar sheet, the corrugated sheet and the planar sheet being wound together, the corrugated sheet including an outer surface having crests and an inner surface having crests; first and second joining portions (17A,17B) brazing the planar sheet and the corrugated sheet together; the first joining portion and the second joining portion being located proximate opposing ends (23,24) of the metal honeycomb structure; the first joining portion including first joining sections formed of brazing materials applied to the crests of the outer surface of the corrugated sheet and second joining sections formed of brazing materials applied to the crests of the inner surface of the corrugated sheet; the second joining portion including first joining sections formed of brazing materials applied to the crests of the outer surface of the corrugated sheet and second joining sections formed of brazing materials applied to the crests of the inner surface of the corrugated sheet; the second joining portion and the joining strip overlapping, the first joining portion and the joining strip not overlapping; the first joining portion having a first brazing length along an axis of the metal honeycomb structure; the second joining portion having a second brazing length along the axis of the metal honeycomb structure; the second brazing length of the second joining portion being larger than the first brazing length of the first joining portion; one of the opposing ends (23,24) of the metal honeycomb structure defining an exhaust outlet of the honeycomb structure, and the joining strip being disposed only on a side of the exhaust outlet, characterized by the fact that the first joining sections of the first joining portion and the first joining sections of the second joining portion are offset from the second joining sections of the first joining portion and the second joining sections of the second joining portion in directions parallel to the axis of the metal honeycomb structure; the metal honeycomb structure has a cylindrical shape; the first joining sections and the second joining sections positioned closer to the joining strip are spaced from each other with clearances (δ 1a) therebetween, oriented in the axial direction of the honeycomb structure; and all of these clearances (δ 1a) are provided within a width of the joining strip in the axial direction of the honeycomb structure, and in that the first joining sections of the second joining portion are located on the side of the exhaust outlet, the first joining sections of the second joining portion have rear ends, and the joining strip has a rear end located rearward of the rear ends of the first joining sections of the second joining portion. a metal outer tube; and a metal honeycomb structure pressed into and joined to the metal outer tube, a joining strip joined to the metal outer tube; a planar sheet; a corrugated sheet placed on the planar sheet, the corrugated sheet and the planar sheet being wound together, the corrugated sheet including an outer surface having crests and an inner surface having crests;