A honeycomb structure comprising: a honeycomb structure body which has a porous partition wall with one end face and another end face, the partition wall defining a plurality of cells, the cells extending from an inflow side end face to an outflow side end face, the inflow side end face being the one end face while the outflow side end face being the other end face, the cells forming channels for exhaust gas; first plugging portions disposed at the outflow side end face of inlet cells and at the inflow side end face of outlet cells, the inlet cells being predetermined cells of the honeycomb structure body, the outlet cells being residual cells of the honeycomb structure body, the first plugging portions plugging the cells with a first plugging material which is fired; and second plugging portions plugging the cells with a second plugging material, the second plugging material containing an adhesive material and an aggregate, which is not fired afterward and remains unfired, characterized in that: the number of the second plugging portions is within 3% of the number of cell open ends where the first plugging portions are not formed, on both end faces (2a, 2b) of the honeycomb structure body, the honeycomb structure body is formed by bonding a plurality of honeycomb segments, each honeycomb segment including the porous partition wall which defines the plurality of cells, and the second plugging portions are provided in a range up to the third cells from an outermost circumference of the honeycomb segment. a honeycomb structure body which has a porous partition wall with one end face and another end face, the partition wall defining a plurality of cells, the cells extending from an inflow side end face to an outflow side end face, the inflow side end face being the one end face while the outflow side end face being the other end face, the cells forming channels for exhaust gas; first plugging portions disposed at the outflow side end face of inlet cells and at the inflow side end face of outlet cells, the inlet cells being predetermined cells of the honeycomb structure body, the outlet cells being residual cells of the honeycomb structure body, the first plugging portions plugging the cells with a first plugging material which is fired; and second plugging portions plugging the cells with a second plugging material, the second plugging material containing an adhesive material and an aggregate, which is not fired afterward and remains unfired, characterized in that: the number of the second plugging portions is within 3% of the number of cell open ends where the first plugging portions are not formed, on both end faces (2a, 2b) of the honeycomb structure body, the honeycomb structure body is formed by bonding a plurality of honeycomb segments, each honeycomb segment including the porous partition wall which defines the plurality of cells, and the second plugging portions are provided in a range up to the third cells from an outermost circumference of the honeycomb segment. the number of the second plugging portions is within 3% of the number of cell open ends where the first plugging portions are not formed, on both end faces (2a, 2b) of the honeycomb structure body, the honeycomb structure body is formed by bonding a plurality of honeycomb segments, each honeycomb segment including the porous partition wall which defines the plurality of cells, and the second plugging portions are provided in a range up to the third cells from an outermost circumference of the honeycomb segment.