PROBLEM TO BE SOLVED: To provide a racehorse training race bib 20 made of a regenerated polyester fiber, in which a saddle placed on the race bib is not easily displaced with respect to the horse body, and is soft and more adapted to the horse body. SOLUTION: Recycled polyester fiber material having a mass of 400 to 500 g / m 2, wherein right and left main body parts 21 and 22 are cut from a cloth whose both surfaces are brushed. The racehorse training bib 20 is provided with a number cloth 29 attached to the surface of the left main body 22. [Selection] Figure 2【課題】 ゼッケンの上に乗せる鞍が馬体に対してずれ難く、且つ、ソフトでより一層馬体に馴染む、再生ポリエステル繊維製の競走馬調教用ゼッケン20を提供する。【解決手段】 質量が400乃至500g/m2の再生ポリエステル繊維素材の布であって、両面が起毛処理された生地から左右本体部21,22が切断されて作成されており、右本体部21及び左本体部22の表面に各々番号布29が取り付けられている競走馬調教用ゼッケン20とする。【選択図】 図2