The invention provides an AC/DC converter which can suppress higher harmonic current at a low cost and realize improvement of a power factor. The AC/DC converter is provided with a rectifier (2), capacitors (6, 7), a first bidirectional switch (3), a second bidirectional switch (4) and a control unit (20), wherein the rectifier (2) is connected to an AC power supply (1) via a reactor (5); the capacitors (6, 7) are serially connected between output terminals of the rectifier (2); one end of the first bidirectional switch (3) is connected to one input terminal of the rectifier (2), and the other end is connected to a connection point of the capacitors (6, 7); one end of the second bidirectional switch (4) is connected to another input terminal of the rectifier (2), and the other end is connected to the other end of the first bidirectional switch (3); and the control unit is capable of actuating the first bidirectional switch (3) and the second bidirectional switch (4) in the half period of the AC power supply (1) and controlling voltage inputted into the rectifier (2) to an expected output voltage value.