The present invention relates to an analog/digital converter including an analog conversion unit including a plurality of stages having a pipelined configuration and a digital conversion unit. The digital conversion unit has digital-value storage registers, which are each provided for one of the stages. Each of the register is used for storing a digital value completing error correction for each segment, and adapted to output the digital value that corresponds to a segment number. The digital conversion unit also has an error-computation control unit, which controls the stages so that a specific one of the stages, inputs an error computation analog signal. The error-computation control unit then computes an error of the specific stage on the basis of digital-converted data computed from the digital values corresponding to segment numbers received from all the stages following the specific stage.