A honeycomb structure includes a pillar-shaped honeycomb structure body having a porous partition wall. The honeycomb structure body includes a plurality of cells defined by the partition wall so as to extend from a first end face to a second end face of the honeycomb structure body, the partition wall is formed by a porous body including a silicon phase as a main phase, and the silicon phase as the main phase has content of each of metals other than silicon and metals making up silicide that is 0.3 part by mass or less with respect to 100 parts by mass of silicon.