Provided is an imaging device and a camera system capable of making wind dynamic range photography. The imaging device includes: a first imaging cell including a first photoelectric converter that generates a first signal by photoelectric conversion, and a first signal processing circuit that is electrically connected to the first photoelectric converter and detects the first signal; and a secondimaging cell including a second photoelectric converter that generates a second signal by photoelectric conversion, and a second signal processing circuit that is electrically connected to the secondphotoelectric converter and detects the second signal. Sensitivity of the first imaging cell is higher than sensitivity of the second imaging cell. The first signal processing circuit has a circuit configuration different from the second signal processing circuit. An operation frequency of the first signal processing circuit is different from an operation frequency of the second signal processingcircuit.