Projector and focus adjustment method

A projector comprising:

• a display element that is provided with an image-forming surface comprising a plurality of pixels;
• a projection lens that is capable of focus adjustment and that projects an image that is formed on said image-forming surface upon a projection surface;
• a distortion correction processing unit that, based on distortion correction data for correcting distortion of an image that is projected on said projection surface, enlarges and/or reduces an image that is indicated by a video signal that is received as input to generate a corrected image and causes formation of the corrected image on said image-forming surface;
• and
• a control unit that, based on said distortion correction data, carries out focus adjustment of said projection lens such that a focus range on said projection surface increases, wherein:
• said distortion correction data include, for each of said plurality of pixels, a correction coefficient value that corresponds to a projection distance to said projection surface;
• and
• said control unit carries out focus adjustment of said projection lens in which, from among pixel regions in which pixel having a same correction coefficient value are arranged, the pixel region having a greatest number of pixels is taken as an optimal focus point.