The subject of this invention is providing the vanadium dioxide containing particle | grains excellent in the fastness with respect to the thermal expansion accompanying heating and cooling. The vanadium dioxide-containing particles of the present invention have thermochromic properties, the element A having a Pauling electronegativity in the range of 1.65 to 2.05, and the Pauling electronegativity of 2.10 to 2. Element B within the range of 54, the total content of element A is within the range of 0.5 to 20 atom% with respect to vanadium (100 atom%), and the total content of element B is 0. It is in the range of 0.05 to 20 atom%.
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