A scanning endoscope system includes: a fiber that guides illuminating light emitted from a light source a first actuator provided on a side of the fiber, the first actuator expanding/contracting according to an applied voltage, thereby swinging the fiber a second actuator disposed at a position facing the first actuator across the fiber, the second actuator expanding/contracting according to an applied voltage, thereby swinging the fiber and a drive signal output section that applies a first drive signal that varies with reference to a first voltage that brings the first actuator into a contracted state to the first actuator and applies a second drive signal that varies with reference to a second voltage that brings the second actuator into a contracted state to the second actuator.
