The present invention is to provide an inexpensive temperature controller. A temperature controller (11) adjusts a temperature, and a cable device (29) is attachable to and detachable from the temperature controller. The temperature controller (11) includes a substrate side contact portion (21) formed on a surface (12a) on one side of a circuit substrate (12) for processing an input signal and brought into contact with the cable device (29) without having a particular-shape acceptance port for accepting a connection portion to be connected to the cable device (29). Therefore, the temperature controller (11) can be connected to the cable device (29) by the substrate side contact portion (21) formed on the surface (12a) on the one side of the circuit substrate (12). In this case, in the temperature controller (11), there is no need for having the particular-shape acceptance port for accepting the connection portion to be connected to the cable device (29). As a result, the inexpensive temperature controller (11
