A solid-state imaging device comprising: a pixel part having a pixel arranged therein, the pixel performing photoelectric conversion; and a reading circuit having an analog-to-digital conversion function for analog-to-digital converting a pixel signal read out from the pixel to a signal line, wherein the pixel signal read out from the pixel is at least either one of: a first pixel signal (pixout1) including a read-out reset signal (VRST) and a read-out luminance signal (VSIG) that are read out in the stated order from the pixel in a rolling shutter mode; and a second pixel signal (pixout2) including a read-out luminance signal (VSIG) and a read-out reset signal (VRST) that are read out in the stated order from the pixel in a global shutter mode, wherein the reading circuit includes: an amplifying part for amplifying the pixel signal; and an AD converting part for analog-to-digital converting, in connection with a search signal, the pixel signal amplified by the amplifying part, and wherein the search signal includes a first search signal (Vramp1) for the first pixel signal and a second search signal (Vramp2) for the second pixel signal, the first search signal and second search signal each being configurable such that signal waveform slopes thereof are inverted; wherein the amplifying part includes: a first operational amplifier; a first sampling capacitor connected between (i) an input line for the first pixel signal or the second pixel signal and (ii) a first input terminal of the first operational amplifier (-); a first feedback capacitor connected between an output terminal of the first operational amplifier or the first input terminal; an offset potential; and a first switch part for selectively connecting one of ends of the first feedback capacitor to the output terminal of the first operational amplifier or the offset potential, and wherein a second input terminal of the first operational amplifier (+) is connectable at least to a referential potential (Vref). a pixel part having a pixel arranged therein, the pixel performing photoelectric conversion; and a reading circuit having an analog-to-digital conversion function for analog-to-digital converting a pixel signal read out from the pixel to a signal line, wherein the pixel signal read out from the pixel is at least either one of: a first pixel signal (pixout1) including a read-out reset signal (VRST) and a read-out luminance signal (VSIG) that are read out in the stated order from the pixel in a rolling shutter mode; and a second pixel signal (pixout2) including a read-out luminance signal (VSIG) and a read-out reset signal (VRST) that are read out in the stated order from the pixel in a global shutter mode, a first pixel signal (pixout1) including a read-out reset signal (VRST) and a read-out luminance signal (VSIG) that are read out in the stated order from the pixel in a rolling shutter mode; and a second pixel signal (pixout2) including a read-out luminance signal (VSIG) and a read-out reset signal (VRST) that are read out in the stated order from the pixel in a global shutter mode, wherein the reading circuit includes: an amplifying part for amplifying the pixel signal; and an AD converting part for analog-to-digital converting, in connection with a search signal, the pixel signal amplified by the amplifying part, and wherein the search signal includes a first search signal (Vramp1) for the first pixel signal and a second search signal (Vramp2) for the second pixel signal, the first search signal and second search signal each being configurable such that signal waveform slopes thereof are inverted; wherein the amplifying part includes: a first operational amplifier; a first sampling capacitor connected between (i) an input line for the first pixel signal or the second pixel signal and (ii) a first input terminal of the first operational amplifier (-); a first feedback capacitor connected between an output terminal of the first operational amplifier or the first input terminal; an offset potential; and a first switch part for selectively connecting one of ends of the first feedback capacitor to the output terminal of the first operational amplifier or the offset potential, and wherein a second input terminal of the first operational amplifier (+) is connectable at least to a referential potential (Vref). an amplifying part for amplifying the pixel signal; and an AD converting part for analog-to-digital converting, in connection with a search signal, the pixel signal amplified by the amplifying part, and wherein the search signal includes a first search signal (Vramp1) for the first pixel signal and a second search signal (Vramp2) for the second pixel signal, the first search signal and second search signal each being configurable such that signal waveform slopes thereof are inverted; a first operational amplifier; a first sampling capacitor connected between (i) an input line for the first pixel signal or the second pixel signal and (ii) a first input terminal of the first operational amplifier (-); a first feedback capacitor connected between an output terminal of the first operational amplifier or the first input terminal; an offset potential; and a first switch part for selectively connecting one of ends of the first feedback capacitor to the output terminal of the first operational amplifier or the offset potential, and wherein a second input terminal of the first operational amplifier (+) is connectable at least to a referential potential (Vref).