Provided is an electronic instrument in which a starting voltage of a power supply is less than a starting voltage of a general booster circuit, and which is capable of starting efficiently. The electronic instrument includes: a power supply for supplying power; a first booster circuit that is started with the power from the power supply; a capacitor for storing power of the first booster circuit; a second booster circuit that is started with the power in the capacitor; a load circuit operating with power of the second booster circuit; a voltage detection circuit for detecting a voltage of the capacitor; and a switching element controlled by a voltage detection signal, in which, when determining that the voltage of the capacitor is a predetermined voltage or more, the voltage detection circuit turns off the switching element and starts the second booster circuit with the power of the capacitor.