1. A projector device, comprising:a plurality of light sources each of which emits a different type of color light;
a plurality of image forming elements each of which, upon irradiation with the different type of color light, forms an image based on a respective video signal corresponding to the different type of color light;
a plurality of sensors that are arranged in response to each of the plurality of light sources, each sensor being configured to detect a part of light emitted from a corresponding light source from among the plurality of light sources and being further configured such that a part of light from an image forming element of the image forming elements, to which the light from the corresponding light source is irradiated, enters said each sensor as stray light; and
a controller that acquires luminance of the image formed by each of the plurality of image forming elements based on the respective video signal, makes a correction in which a component of the stray light is removed from respective detection values detected by the plurality of sensors based on an acquired respective image luminance, and adjusts a white balance by controlling outputs from the plurality of light sources based on the detection values of the plurality of sensors after the correction.