An A-D converter includes a first amplifier circuit, an A-D converter circuit, a D-A converter circuit, a subtraction circuit, a second amplifier circuit, a timing control circuit, a type control unit, an output unit. The type control unit sets the type of the A-D converter circuit at the time of conversion to the higher 4 bits, to a type in which either one of an analog signal or a reference voltage is inputted selectively to a comparator via a capacitor. The type control unit performs a control so that the type of the A-D converter circuit at the time of conversion to values of the higher 5th to 7th bits and the higher 8th to 10th bits from the most significant bit, to a type in which an analog signal and a reference voltage are inputted fixedly to a comparator without involving a capacitor.