Provided are a solid-state imaging device and A/D converter circuit comprising: series-connected capacitative elements; a voltage comparator circuit comparing the output of the capacitative element C1 with a threshold voltage; a first input circuit inputting an analog voltage signal to the node between the capacitative elements C1 and C2; a second input circuit inputting a first reference voltage, monotonously changing in a first conversion process for finding the upper-order bit value, to the node between the capacitative elements C2 and C3; a third input circuit inputting a second reference voltage, monotonously changing in a second conversion process for finding an unconverted bit value after the first conversion process, to the input terminal of the capacitative element C3; and a control circuit generating a control signal to hold the first reference voltage in the capacitative element C3 when the output of the voltage comparator circuit changes in the first conversion process.