THERMOELECTRIC CONVERSION DEVICE

A thermoelectric conversion device includes first thermoelectric layers and second thermoelectric layers that are alternately provided in a first direction parallel to surfaces of the first thermoelectric layers and the second thermoelectric layers, the first thermoelectric layers having conductivity types opposite to those of the second thermoelectric layers, first connection layers and second connection layers that are electrically and thermally connected to the first thermoelectric layers and the second thermoelectric layers between the first thermoelectric layers and the second thermoelectric layers, the first connection layers and the second connection layers being alternately provided in the first direction, first thermally conductive layers that are thermally connected to the first connection layers, the first thermally conductive layers extending in a second direction intersecting the surfaces, a first insulating layer through which the first thermally conductive layers penetrate, the first insulating layer having a thermal conductivity smaller than thermal conductivities of the first thermally conductive layers, a second insulating layer through which the first thermally conductive layers penetrate, the second insulating layer having a thermal conductivity smaller than the thermal conductivity of the first insulating layer, the second insulating layer being provided between the first insulating layer and the first thermoelectric layers and the second thermoelectric layers, the second insulating layer having a thickness equal to or greater than 1/4 of a larger distance of a distance between an end of the first thermally conductive layer at a side of the first thermoelectric layer and a center of the second connection layer in the first direction and a distance between an end of the first thermally conductive layer at a side of the second thermoelectric layer and the center of the second connection layer in the first direction.