There is provided an analog-to-digital converter capable of performing analog-to-digital conversion with good accuracy. The analog-to-digital converter in accordance with the present invention includes a dither generation circuit 11 which generates dither; an input polarity switching unit 1 which switches a polarity of an input signal; an integrator 2; an integrator output regulator circuit 5 which regulates an output voltage of the integrator 2; a window comparator 3; a control circuit 4 which uses the comparison result of the window comparator 3 to control the input polarity switching unit 1, the integrator output regulator circuit 5, and the window comparator 3 as well as to generate a digital signal. The dither generation circuit 11 generates dither in such a manner that a cycle in which the digital signal is read is an integral multiple of a dither cycle. Further, the dither generation circuit 11 generates dither in such a manner that the number of times the count value is generated in the first half of one cycle of the dither is different from the number of times the count value is generated in the second half cycle thereof.