A bias sampling device includes a reference current generation unit suitable for generating a reference current; a plurality of multi-staged current mirror circuits suitable for receiving the reference current generated from the reference current generation unit and outputting a bias voltage; and a bias sampling unit suitable for performing sampling on a first bias voltage of a first current mirror circuit of the plurality of multi-staged current mirror circuits, wherein the first bias voltage of the first current mirror circuit, which is located prior to a final-staged current mirror circuit of the plurality of multi-staged current mirror circuits, is preset.