A solid-state imaging apparatus including: a pixel section having unit pixels arranged into a two-dimensional matrix, each unit pixel containing a photoelectric conversion section for effecting a photoelectric conversion and an amplification section for amplifying and reading signal charges generated at the photoelectric conversion section; a current supply provided for each column for flowing a bias current to the amplification section; a column processing section provided for each column for processing a signal from the amplification section column by column; an output section for sequentially reading signals processed column by column at the column processing section and outputting them to an external signal processing circuit; and a bias current controlling section for controlling the bias current of the current supply in accordance with a gain setting at the external signal processing circuit.