Thermoelectric conversion device

The thermoelectric conversion device includes: first thermoelectric layers (12a) and second thermoelectric layers (12b) having conductivity types opposite to each other and alternately disposed in a first direction parallel to surfaces of the first thermoelectric layers and the second thermoelectric layers; a first connection layer (14a) and a second connection layer (14b) alternately disposed in the first direction and between the first thermoelectric layer and the second thermoelectric layer to electrically and thermally connect to the first thermoelectric layer and the second thermoelectric layer; a first thermally conductive layer (16a) thermally connected to the first connection layer and extending in a second direction intersecting a surface thereof; a first insulating layer (17a) through which the first thermally conductive layer penetrates and which has a thermal conductivity smaller than that of the first thermally conductive layer; and a second insulating layer (17b) through which the first thermall