NOVELTY - The device (13) has a thermoelectric conversion element i.e. peltier device (25), for enabling heating or cooling of external air introduced into an inside of an electric vehicle to drive the vehicle. A control part i.e. control apparatus (28), controls electric current supplied to the thermoelectric conversion element such that an electric current supply amount to the thermoelectric conversion element is controlled based on temperature of the external air circulated through a supply-flow channel (22) before the control part heat-exchanges with the electronic device and speed of the vehicle.    USE - Temperature adjusting device for temperature-controlling an electronic device e.g. secondary battery and motor, mounted in an electric vehicle. Can also be used for temperature-controlling a DC-DC converter mounted in a motor vehicle.    ADVANTAGE - The control apparatus derives required temperature and necessary speed for temperature-controlling the battery based on the temperature of the battery, temperature of external air before heat-exchanging with the battery and the vehicle speed such that difference of the temperature of external air and required temperature can be supplemented when the temperature of external air is less than required temperature, so that cooling or heating of the external air excessively by the conversion element can be prevented and useless electric current amount supplied to the conversion element can be reduced, thus reducing power consumption accompanying the drive of the conversion element and improving cooling efficiency with respect to the battery. The control apparatus supplies electric current amount required for temperature control of the battery to the conversion element when the battery is not temperature-controlled in specified temperature, so that temperature of the external air can temperature-control the battery efficiently. The device makes temperature of the external air to turn into preset required temperature by driving the conversion element and an air blower such that speed of the electric vehicle turns into the preset necessary speed, thus reducing need for a temperature sensor and minimizing number of parts of the device.    DETAILED DESCRIPTION - The inside of the vehicle contains a battery accommodating part (21).    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a temperature adjusting device.'(Drawing includes non-English language text)'    Temperature adjusting device (13)    Battery accommodating part (21)    Supply-flow channel (22)    Air blower (24)    Peltier device (25)    Control apparatus (28)