PURPOSE: A current supply device is provided to supply a stable current by compensating the change of external circumstances. CONSTITUTION: A voltage regulator(10) outputs an output voltage according to the difference between a power voltage and an input voltage. An output resistor(40) includes a plurality of switching elements. A circumstance change detector(20) generates a driving control signal for the switching elements. One end of capacitor(50) is connected between an output terminal of the circumstance change detector and a driving control terminal of the switching element. [Reference numerals] (20) Circumstance change detector; (30) Output checking processor
