A heating device and a heating method which is able to quickly and accurately partition each region of a material to be heated and heat up each of the region to a required temperature, and a shape and required temperature of each region is different from each other. A heating device for heating a material to be heated by applying an electromagnetic wave to the material, wherein a plate member(s) which shields, absorbs and/or reflects the irradiated electromagnetic radiation and has a predetermined pattern contour can be placed, at least partially, close to the material to be heated.