Honeycomb structure and exhaust gas purifying device

A pillar shaped honeycomb structure, comprising:

• an outer peripheral wall;
• and
• porous partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells penetrating from one end face to other end face to form a flow path,
• wherein at least one cell of the cells has a magnetic substance coated with glass,
• the magnetic substance coated with the glass is provided in a form of a layer on surfaces of the partition walls in the cell to form a coating layer,
• the coating layer has an open porosity of 40 to 90%,
• the glass coating the magnetic substance has a thickness of 1 to 10 μm, and
• a ratio of a thermal expansion coefficient α1 of the magnetic substance to a thermal expansion coefficient α2 of the glass:
• α1/α2 is 0.8 to 1.2.