To contribute to simplification of control, stabilization of operation, durability improvement, and reliability improvement, and to carry out cost reduction by simplification of a circuit configuration, and reduction of the number of components.

When composing the thermo-module controller 1 controlling energization of a thermo-module 30 using a plurality of Peltier elements C, it is provided with a direct current power source part 2 having alternating current input parts 2i, 2i and direct current output parts 2p, 2n, a relay switch 3 connected between the direct current output parts 2p, 2n and the thermo-module 30 to change polarities from the direct current output parts 2p, 2n with respect to the thermo-module 30, an SSR (solid state relay) 4 controlling an input current Ii passing through the alternating current input part 2i and an output current Io passing through the direct current output part 2p, and a control part 5 carrying out control with respect to at least the relay switch 3 and the SSR 4.