A solid-state image pickup apparatus 1A includes a photodetecting section 10A, a signal readout section 20, and a controlling section 40A. In the photodetecting section 10A, M×N pixel units P 1,1 to P M,N each including a photodiode and a readout switch are arrayed in M rows and N columns. Charges generated in each pixel unit P m,n are input to an integrating circuit S n through a readout wiring L O,n , and a voltage value output from the integrating circuit S n in response to the charge amount is output through a holding circuits H n . When in a first imaging mode, a voltage value according to an amount of charges generated in the photodiode PD of each of the M×N pixel units P 1,1 to P M,N in the photodetecting section 10A is output from the signal readout section 20. When in a second imaging mode, a voltage value according to an amount of charges generated in the photodiode PD of each pixel unit P m,n included in consecutive M 1 rows in the photodetecting section 10A is output from the signal readout section 20.
