The present technology relates to an imaging device, a driving method, and an electronic apparatus capable of more quickly acquiring a high-quality image. In a pixel of a solid-state imaging device, a photoelectric conversion unit that performs a photoelectric conversion of incident light is disposed. An electric charge/voltage converting unit converts electric charge acquired by the photoelectric conversion unit into a voltage signal. A signal comparator compares a supplied reference signal with the voltage signal acquired by the electric charge/voltage converting unit and outputs a result of the comparison. A storage unit adaptively changes the conversion efficiency of the electric charge/voltage converting unit on the basis of a control signal acquired on the basis of a result of the comparison output from the signal comparator. The present technology can be applied to a solid-state imaging device.