To provide a method of connecting integrally juxtaposed Peltier/Seebeck element chips forming a Peltier-effect-type or a Seebeck-effect-type thermoelectric conversion element circuit system.

A serial cable 14 or a parallel cable with an arbitrary length having a male or female multi-terminal connector having the same number of terminals as the number of connection terminals on an element chip surface is prepared. A parallel-type cable with an arbitrary length having male-and-female or male-and-male or female-and-female multi-terminal connectors at both ends of the cable is prepared as an extension cable. A serial cable with an arbitrary length has the female multi-terminal connector for the male multi-terminal connector or the male multi-terminal connector for the female multi-terminal connector so that a circuit system including a plurality of element chips connected via the multi-terminal connector is serial at one of ends of the cable, and the plurality of male or female multi-terminal connectors are attached to the other end of the serial cable 14.