A converter device comprising: a booster device including a shunt resistor with one end thereof being connected to a common bus on a low potential side, and a plurality of booster circuits (32-1 to 32-m) that are connected to one another in parallel and are connected between the other end of the shunt resistor and an input bus on a high potential side; and a control unit that executes pulse-width modulation control on the plurality of booster circuits (32-1 to 32-m), wherein the plurality of booster circuits (32-1 to 32-m) respectively include a coil with one end thereof being connected to the input bus on the high potential side and a switching element (42-1 to 42-m) with an input-output path thereof being connected between the other end of the coil and the other end of the shunt resistor and with a control terminal thereof having a pulse-width modulation signal applied thereto from the control unit, and the control unit collates a timing of an on-time of a pulse-width modulation signal to be applied to the switching element (42-1 to 42-m) and a timing of a current flowing in the shunt resistor so as to determine in which booster circuit (32-1 to 32-m), among the plurality of booster circuits (32-1 to 32-m), a current that flows in the shunt resistor flows, and corrects the on-time of the pulse-width modulation signal based on a ratio of a predetermined target current value with respect to a value of a current that flows in the shunt current when the pulse-width modulation signal to be applied to the switching element (42-1 to 42-m) is turned on so as to suppress fluctuations of a plurality of currents flowing in the plurality of booster circuits (32-1 to 32-m) caused by electric characteristics or circuit patterns of the plurality of booster circuits (32-1 to 32-m), thereby executing control of approximating the plurality of currents flowing in the plurality of booster circuits (32-1 to 32-m) to the one target current value. a booster device including a shunt resistor with one end thereof being connected to a common bus on a low potential side, and a plurality of booster circuits (32-1 to 32-m) that are connected to one another in parallel and are connected between the other end of the shunt resistor and an input bus on a high potential side; and a shunt resistor with one end thereof being connected to a common bus on a low potential side, and a plurality of booster circuits (32-1 to 32-m) that are connected to one another in parallel and are connected between the other end of the shunt resistor and an input bus on a high potential side; and a control unit that executes pulse-width modulation control on the plurality of booster circuits (32-1 to 32-m), wherein the plurality of booster circuits (32-1 to 32-m) respectively include a coil with one end thereof being connected to the input bus on the high potential side and a switching element (42-1 to 42-m) with an input-output path thereof being connected between the other end of the coil and the other end of the shunt resistor and with a control terminal thereof having a pulse-width modulation signal applied thereto from the control unit, and the control unit collates a timing of an on-time of a pulse-width modulation signal to be applied to the switching element (42-1 to 42-m) and a timing of a current flowing in the shunt resistor so as to determine in which booster circuit (32-1 to 32-m), among the plurality of booster circuits (32-1 to 32-m), a current that flows in the shunt resistor flows, and corrects the on-time of the pulse-width modulation signal based on a ratio of a predetermined target current value with respect to a value of a current that flows in the shunt current when the pulse-width modulation signal to be applied to the switching element (42-1 to 42-m) is turned on so as to suppress fluctuations of a plurality of currents flowing in the plurality of booster circuits (32-1 to 32-m) caused by electric characteristics or circuit patterns of the plurality of booster circuits (32-1 to 32-m), thereby executing control of approximating the plurality of currents flowing in the plurality of booster circuits (32-1 to 32-m) to the one target current value.