A fitness roller body includes a rod member, an enlarged wheel body is disposed at each end of the rod member, and a flange is formed at a boundary between the two wheel body and the rod member, and the outer side of the flange is provided a curved surface, and two sides of the rod member are respectively disposed along the longitudinal direction of the rod member, and a center of the wheel body surface is bored with a discharge hole and the inlet hole. Turning on, when the rod is placed in a two-pair mold, the plastic is injected, and when a first rubber sleeve portion is formed on the outer side of the rod member, the plastic material uses the inlet hole and the discharge hole. The connection is conducted, and the outer surface of the second wheel body is conveyed from the inside of the rod at the same time, so that the plastic material can avoid the flange, so that the rods of different colors can obtain sufficient appearance by using the surface of the flange. A second rubber sleeve portion is formed on each of the outer sides of the two wheel bodies.一種健身滾輪本體，其包含有一桿件，該桿件兩端各設有一擴大的輪體，在所述二輪體與所述桿件交界各形成有一圈凸緣，且該凸緣外側是設有曲線狀之表面，又所述桿件兩側沿著所述桿件的長軸方向各設置有一入料孔，所述輪體表面中央則以一出料孔的穿設與該入料孔進行導通，當所述桿件放置在二對合的模具內塑膠射出，俾以在所述桿件外側形成一第一膠套部時，其塑膠料便會利用該入料孔與出料孔的連接導通，從桿件內部同時往所述二輪體的外表面做輸送，讓塑膠料能避開所述凸緣，使不同顏色之桿件能利用該凸緣之表面獲得充分的外顯後，再於所述二輪體外側各形成有一第二膠套部。
