A projector includes: an image projection unit that projects an image; a trapezoidal correction unit that performs trapezoidal correction on the image projected by the image projection unit; a nonvolatile storage unit that stores the amount of previous trapezoidal correction and a predetermined acceptable value associated with the amount of previous trapezoidal correction, the amount of previous trapezoidal correction being used immediately before at least one of when the projector is turned off and when signal processing is changed; and an adjustment unit that sets, if the amount of previous trapezoidal correction is greater than the predetermined acceptable value, the amount of trapezoidal correction to be performed by the trapezoidal correction unit at a predetermined standard value or zero after the projector is activated or after the signal processing is changed.