To provide a thermoelectric conversion element that has guest particles uniformly dispersed in a base material and has superior performance, and a method of manufacturing the same.

The present invention relates to the method of manufacturing the thermoelectric conversion element 1 by dispersing a plurality of guest particles 5 made of a material different from the base material 3 made of a thermoelectric conversion material in the base material 3, in which the guest particles 5 are manufactured using two or more kinds of substances differing in weight so that the specific gravity of each guest particle 5 is equal to the specific gravity of the base material 3, and the guest particles 5 are mixed with the base material 3 to be uniformly dispersed. As the guest particles 5, guest particles 5 are used which have a core shell structure including a center part 7 and an outer peripheral layer 9 covering a surface thereof, the outer peripheral layer 9 being made of at least one kind of substance different from that of the center part 7.

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