Heating method of the honeycomb structure

Uneven temperature during heating is small, and be well heating the honeycomb structure with low power consumption to provide a heating method of the honeycomb structure as possible. Partition walls 1 of the porous defining a plurality of cells 2, and has an outer peripheral wall 3 located in the outermost periphery, a cylindrical honeycomb structure portion 4 which generates heat by energization, is loaded on the partition walls 1 of the honeycomb structure portion 4 was the catalyst 7, to supply power to the honeycomb structured portion 4 of the honeycomb structure 100 with a, with a heating step of heating the honeycomb structured portion 4 to the target temperature, the heating step, heating portion of the honeycomb structured portion 4 in before the lowest temperature reaches the target temperature, the supply power reduction period to reduce power power supplied to or honeycomb structure portion 4 stops supply to the honeycomb structure portion 4, the honeycomb structure provided at least once heat method.