A method of producing a thermoelectric converter which performs: a step of preparing an insulating base which contains thermoplastic resin and has formed therein a plurality of first and second via holes (11, 12) extending through a thickness thereof, the first via holes being filled with a first conductive paste, the second via holes being filled with a second conductive paste; a step of placing a front side protective member on a front surface of said insulating base and also placing a reverse side protective member on a reverse surface of said insulating base to make a stack body, the front side protective member having front side conductive layers contacting given ones of the first and second conductive pastes, the reverse side protective member having reverse side conductive layers contacting given ones of the first and second conductive pastes; and a uniting step of pressing the stack body in a stacking direction while heating the stack body to make first and second layer-to-layer connecting members (40, 50) of the first and second conductive pastes and also to electrically connect the first and second layer-to-layer connecting members with said front side conductive layers and said reverse side conductive layers, in that a paste made by adding an organic solvent to powder of alloy in which a plurality of atoms keep a given crystal structure is used as the first conductive paste, in that a paste made by adding an organic solvent to powder of metal which is different in kind from said alloy is used as the second conductive paste, characterized in that in the step of making the stack body, cavities (13 to 17) are formed inside the stack body, and in that in the uniting step, said cavities work to facilitate flow of said thermoplastic resin to absorb pressure acting on said first conductive pastes in a direction different from the stacking direction, thereby increasing pressure applied to the stack body in the stacking direction to solid-state sinter the first conductive pastes to make the first layer-to-layer connecting members. a step of preparing an insulating base which contains thermoplastic resin and has formed therein a plurality of first and second via holes (11, 12) extending through a thickness thereof, the first via holes being filled with a first conductive paste, the second via holes being filled with a second conductive paste; a step of placing a front side protective member on a front surface of said insulating base and also placing a reverse side protective member on a reverse surface of said insulating base to make a stack body, the front side protective member having front side conductive layers contacting given ones of the first and second conductive pastes, the reverse side protective member having reverse side conductive layers contacting given ones of the first and second conductive pastes; and a uniting step of pressing the stack body in a stacking direction while heating the stack body to make first and second layer-to-layer connecting members (40, 50) of the first and second conductive pastes and also to electrically connect the first and second layer-to-layer connecting members with said front side conductive layers and said reverse side conductive layers, in that a paste made by adding an organic solvent to powder of alloy in which a plurality of atoms keep a given crystal structure is used as the first conductive paste, in that a paste made by adding an organic solvent to powder of metal which is different in kind from said alloy is used as the second conductive paste, characterized in that in the step of making the stack body, cavities (13 to 17) are formed inside the stack body, and in that in the uniting step, said cavities work to facilitate flow of said thermoplastic resin to absorb pressure acting on said first conductive pastes in a direction different from the stacking direction, thereby increasing pressure applied to the stack body in the stacking direction to solid-state sinter the first conductive pastes to make the first layer-to-layer connecting members.