There is provided a honeycomb structure 1 having partition walls 2 to form cells 3 extending in the axial direction and having a polygonal section, and an outer wall 4 surrounding the plurality of partition walls 2. The partition walls 2 have an average thickness (Tp) of 0.038 to 0.17 mm. The outer wall 4 has an average thickness (Ts) satisfying a relation of Tp