An inversion table has a mounting bracket, a backrest, an ankle clamp assembly and a holding device. The mounting bracket has a rear supporting frame and two front supporting legs. The backrest is connected pivotally to the rear supporting frame. The ankle clamp assembly is securely connected to the backrest to clamp a person's ankles. The holding device is mounted on the rear supporting frame of the mounting bracket at a position opposite to the ankle clamp assembly and has two holding bars. Each holding bar has two self-casings connected to each other around the rear supporting frame and each self-casing has a mounting segment and a holding segment. The mounting segment is mounted on the rear supporting frame and has a mounting recess and multiple supporting ribs. The holding segment is formed on the free ends of the mounting segment to provide a holding and gripping effect.