PROBLEM TO BE SOLVED: To provide a foreign matter removing device that can safely and effectively remove foreign matter adhered on a surface of a floating ball.SOLUTION: A device includes: a floating ball support member including a circumferential part for supporting the floating ball in any position on a surface of the floating ball, which has a space therein; a rotary table arranged in the space in the floating ball support member, which has a rotary surface facing the floating ball; one or a plurality of foreign matter removing members arranged on the rotary surface, each of which has a blade part for removing the foreign matter from the surface of the floating ball; a support mechanism for supporting the rotary table and applying pressing force to the rotary table which presses the rotary table to a direction of the floating ball; and a drive mechanism for rotating the rotary table.【課題】 浮玉の表面に付着した異物を安全かつ効果的に除去することが可能な異物除去装置を提供する。【解決手段】 本発明に係る装置は、浮玉の表面のいずれかの位置において浮玉を支持する円周部を含み、内部に空間を有する、浮玉支持部材と、浮玉支持部材の空間内に配置され、浮玉に対向する回転面を有する、回転テーブルと、回転面上に配置され、浮玉の表面から異物を除去するための刃部を各々が有する、1つ又は複数の異物除去部材と、回転テーブルを支持するとともに、回転テーブルを浮玉の方向に押し付ける押付力を回転テーブルに与える、支持機構と、回転テーブルを回転させる、駆動機構とを備える。【選択図】 図1