The object is to provide a precured tread for a retreaded tire improving attachability to a base tire. In a strip-shaped precured tread 10 to be attached to a crown portion of a base tire 32 from which a tread has been removed, side tread rubbers 14 disposed in side regions CS on both sides of a central region CN are set to have JIS A hardness lower than that of a central tread rubber 12 disposed in the central region CN including a widthwise centerline C so as to improve attachability to a base tire.