A motion vector detection device for detecting a motion vector by the block matching method according to each pixel of the basic field by one or two frames before the input reference field. A sum of difference absolute values of pixel values is successively calculated between a basic block (51) having as an origin a reference pixel (58) in a basic field (30) by one or two frames before an input reference field (40) and a search block (53) in which the reference field (40) is shifted at least every other pixel in the longitudinal direction or/and every other pixel in the lateral direction, thereby specifying a motion vector between the pixel position of the lookup block (53) and the pixel position of the basic pixel (58) where the sum of the difference absolute values is minimum.
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