A thermally conductive composition comprising a thermally conductive filler dispersed in a liquid matrix, wherein a volume-based median diameter of the thermally conductive filler is 0.5 to 100 μm; a content of the thermally conductive filler in the thermally conductive composition is 50 to 95 vol%; the thermally conductive filler comprises a first thermally conductive filler having a Mohs hardness of 3 or more and a second thermally conductive filler having a Mohs hardness of less than 3; in the first thermally conductive filler in the thermally conductive composition, a content of the first thermally conductive filler that has a Mohs hardness of 4 or more and a particle diameter of 10 μm or more is less than 3 vol% based on the whole thermally conductive filler; in the first thermally conductive filler in the thermally conductive composition, a content of the first thermally conductive filler that has a Mohs hardness of 3 or more and a particle diameter of 30 μm or more is less than 3 vol% based on the whole thermally conductive filler; in the first thermally conductive filler in the thermally conductive composition, the total of the content of the first thermally conductive filler that has a Mohs hardness of 4 or more and a particle diameter of 10 μm or more and the content of the first thermally conductive filler that has a Mohs hardness of 3 or more and a particle diameter of 30 μm or more is 1 to 3 vol% based on the whole thermally conductive filler; and the volume-based mixing ratio of the first thermally conductive filler to the second thermally conductive filler (first thermally conductive filler/second thermally conductive filler) is 0.3 to 1.0. a volume-based median diameter of the thermally conductive filler is 0.5 to 100 μm; a content of the thermally conductive filler in the thermally conductive composition is 50 to 95 vol%; the thermally conductive filler comprises a first thermally conductive filler having a Mohs hardness of 3 or more and a second thermally conductive filler having a Mohs hardness of less than 3; in the first thermally conductive filler in the thermally conductive composition, a content of the first thermally conductive filler that has a Mohs hardness of 4 or more and a particle diameter of 10 μm or more is less than 3 vol% based on the whole thermally conductive filler; in the first thermally conductive filler in the thermally conductive composition, a content of the first thermally conductive filler that has a Mohs hardness of 3 or more and a particle diameter of 30 μm or more is less than 3 vol% based on the whole thermally conductive filler; in the first thermally conductive filler in the thermally conductive composition, the total of the content of the first thermally conductive filler that has a Mohs hardness of 4 or more and a particle diameter of 10 μm or more and the content of the first thermally conductive filler that has a Mohs hardness of 3 or more and a particle diameter of 30 μm or more is 1 to 3 vol% based on the whole thermally conductive filler; and the volume-based mixing ratio of the first thermally conductive filler to the second thermally conductive filler (first thermally conductive filler/second thermally conductive filler) is 0.3 to 1.0.