A charging circuit for charging a battery that is configured to supply power to a motor drive system of a battery vehicle including first and second three-phase motors (16, 26) and first and second three-phase inverters (15, 25) for respectively controlling each of the first and second three-phase motors (16, 26), each of the first and second three-phase inverters having first to third sets of switching elements (Q1 to Q6, Q11 to Q16), each set of the switching elements being constituted of two switching elements connected in series and corresponding to one of the three phases, the charging circuit characterized by: a single-phase output transformer which is a Scott connection transformer having first and second secondary-side single-phase output sections (13A, 13B), each of the single-phase output sections having a first terminal (18a, 19a) and a second terminal (18b, 19b); a first rectifier circuit that is connected in parallel with the first three-phase inverter and the battery, the first rectifier circuit being connected to the first terminal of the first single-phase output section; a first line connecting a connecting point between the first set of the switching elements (Q1, Q2) in the first three-phase inverter with the second terminal of the first single-phase output section; a second rectifier circuit that is connected in parallel with the second three-phase inverter and the battery, the second rectifier circuit being connected to the first terminal of the second single-phase output section; a second line connecting a connecting point between the first set of the switching elements (Q11, Q12) in the second three-phase inverter with the second terminal of the second single-phase output section; and a controller that is configured to perform on-off control of the first to third sets of the switching elements in the first and second three-phase inverters (15, 25), wherein, during charging of the battery, the controller is configured to maintain the first set of the switching elements (Q1, Q2, Q11, Q12) in the first and second three-phase inverters (15, 25) in an OFF state, and to perform the on-off control of at least one set of the second and third sets of the switching elements (Q3, Q4, Q5, Q6, Q13, Q14, Q15, Q16) in the first and second three-phase inverters (15, 25). a single-phase output transformer which is a Scott connection transformer having first and second secondary-side single-phase output sections (13A, 13B), each of the single-phase output sections having a first terminal (18a, 19a) and a second terminal (18b, 19b); a first rectifier circuit that is connected in parallel with the first three-phase inverter and the battery, the first rectifier circuit being connected to the first terminal of the first single-phase output section; a first line connecting a connecting point between the first set of the switching elements (Q1, Q2) in the first three-phase inverter with the second terminal of the first single-phase output section; a second rectifier circuit that is connected in parallel with the second three-phase inverter and the battery, the second rectifier circuit being connected to the first terminal of the second single-phase output section; a second line connecting a connecting point between the first set of the switching elements (Q11, Q12) in the second three-phase inverter with the second terminal of the second single-phase output section; and a controller that is configured to perform on-off control of the first to third sets of the switching elements in the first and second three-phase inverters (15, 25), wherein, during charging of the battery, the controller is configured to maintain the first set of the switching elements (Q1, Q2, Q11, Q12) in the first and second three-phase inverters (15, 25) in an OFF state, and to perform the on-off control of at least one set of the second and third sets of the switching elements (Q3, Q4, Q5, Q6, Q13, Q14, Q15, Q16) in the first and second three-phase inverters (15, 25).