Work roll for scale breaker

The objective of the present invention is to provide a highly reliable work roll for scale breakers that includes a body part having high wear resistance and also a shaft part which is less likely to break, and that is capable of ensuring stable life. The present invention achieves said objective by a scale breaker work roll in which a body part 2 is made of a high-speed steel or a semi-high-speed steel, wherein: a shaft insertion part 31 is constituted by fitting a portion of a shaft member 3 made of a material having greater toughness than the high-speed steel or semi-high-speed steel of the body part 2 into a fitting hole 22 opened in each surface 21 on opposite ends of the body part 2; and the body part 2 and each shaft insertion part 31 are integrated.