PROBLEM TO BE SOLVED: To provide an imaging element, imaging device, endoscope, and endoscope system capable of compensating for variation for each manufacture of an impedance matching resistor.SOLUTION: An imaging unit 20 includes: a first transistor 28 that has a gate to which an imaging signal is input; a first resistor 29 that has one end side serially connected to an output end of the first transistor 28; and a compensating unit 30 that is serially connected to the other end side of the first resistor 29, compensates for variation of a resistance value of the first resistor 29, and outputs the imaging signal to the outside.SELECTED DRAWING: Figure 2