An imaging device comprising: a plurality of pixels, each of which includes a light receiving element that generates an electric charge by photoelectric conversion in response to received light, the plurality of pixels comprising a plurality of first pixels and a plurality of second pixels; a pixel circuit that reads the electric charge from the light receiving element and outputs an analog signal corresponding to the electric charge, and a conversion circuit that converts the analog signal into a digital signal on the basis of comparison results obtained by comparing the analog signal and a reference signal whose voltage changes stepwise at a constant slope over time; a generation unit that generates, as reference signals, a first reference signal to be supplied to the first pixels and a second reference signal to be supplied to the second pixels, the generation unit generating the second reference signal by applying an offset to the first reference signal; a first wiring that connects the generation unit and the first pixels; and a second wiring that connects the generation unit and the second pixels, wherein the plurality of pixels are disposed in a two-dimensional grid array, the first wiring is provided to points arranged in a first grid pattern, and the first pixels in the array are disposed in a one-to-one correspondence at each grid point, and the second wiring is provided to points arranged in a second grid pattern, and the second pixels in the array are disposed in a one-to-one correspondence at each grid point, wherein the first and the second grid patterns are grids of every other column and every other row, respectively, wherein the first reference signal is supplied to the first pixels via the first wiring, and the second reference signal is supplied to the second pixels via the second wiring. a plurality of pixels, each of which includes a light receiving element that generates an electric charge by photoelectric conversion in response to received light, the plurality of pixels comprising a plurality of first pixels and a plurality of second pixels; a pixel circuit that reads the electric charge from the light receiving element and outputs an analog signal corresponding to the electric charge, and a conversion circuit that converts the analog signal into a digital signal on the basis of comparison results obtained by comparing the analog signal and a reference signal whose voltage changes stepwise at a constant slope over time; a generation unit that generates, as reference signals, a first reference signal to be supplied to the first pixels and a second reference signal to be supplied to the second pixels, the generation unit generating the second reference signal by applying an offset to the first reference signal; a first wiring that connects the generation unit and the first pixels; and a second wiring that connects the generation unit and the second pixels, wherein the plurality of pixels are disposed in a two-dimensional grid array, the first wiring is provided to points arranged in a first grid pattern, and the first pixels in the array are disposed in a one-to-one correspondence at each grid point, and the second wiring is provided to points arranged in a second grid pattern, and the second pixels in the array are disposed in a one-to-one correspondence at each grid point, wherein the first and the second grid patterns are grids of every other column and every other row, respectively, wherein the first reference signal is supplied to the first pixels via the first wiring, and the second reference signal is supplied to the second pixels via the second wiring.