1. A projector comprising: a projecting portion that projects an image based on input image data; an image data producing portion that produces the image data and then outputs the image data to the projecting portion; an image sensor that captures the projected image and thus produces a captured image; a movement detection sensor that is arranged on a plane parallel to an imaging plane of the image sensor and produces movement information on the basis of the detected movement, the movement detection sensor being longitudinally arranged in a longitudinal direction that is different than a horizontal direction and a vertical direction of the imaging plane, the sensor being configured to determine angular velocity in a direction of rotation about the longitudinal direction of the movement detection sensor so as to determine movement in the horizontal direction and the vertical direction of the imaging plane; a determining portion that determines whether the movement information meets an adjustment condition or not; and a control portion that, when the movement information meets the adjustment condition, controls the image data producing portion so as to adjust the image data on the basis of the captured image.