The utility model provides a honeycomb structure (1) has and sets clathrate unit check wall (11) to and surrounded and a plurality of unit check (12) that form by unit check wall (11), this honeycomb structure (1) have on radial (Y) from central division (10) towards peripheral part (13) and unit check density consecutively or the unit check density distribution that diminishes of stage ground. Honeycomb structure (1) has the smooth unit check wall (112) of following axial (X) and being the wave form unit check walls (111) of wavy extension and being the extension of smooth form along above -mentioned axial (X). Especially, wave form unit check wall (111) to be present in unit check density phase be that unit check density ratio is the region below 0.85 to the ratio of the biggest unit check density. Be present in and more lean on the unit check wall (111) of central part (10) side smooth unit check wall (112) than the existence region of wave form unit check walls (111).