A solid-state image pickup device which is configured not to require transfer of signal charges between pixels performs TDI. An output control section 5 sequentially assigns a pixel signal output processing period to each pixel array group 10 in the order of the vertical direction at an interval of one horizontal processing period H obtained by dividing one frame period T into three. The one frame period T is a period when each pixel array 100 is moved in the vertical direction. An adder 50 sums up a pixel signal held in a signal holding portion 41_X, and a pixel signals held in a signal holding portion 41_R, 41_G, 41_B corresponding to the pixel signal under the control of the output control section 5, and outputs the summation result to an A/D converter 60.