Abstract: This invention relates to a supplementary washing device of a dish washer, which has an additional spraying device that provides a uniform spray of washing water to a wider area. The supplementary washing device of the dish washer includes spray arms formed in the washer tub for spraying water onto dirty dishes and a circular supplementary arm rotated by the washing water flowing out through static pressure influencing means, and a splashing means formed on the circular supplementary arm. The spraying means is a plurality of spiralled blades fixed to the underside of the supplementary arm, becoming lower as they extend to the circumference, or a combination of blades having different lengths and different curvatures of spiral for rotating the supplementary.