the present invention is a hollow article with an integral impact absorbing rib and the method of manufacturing the same . the apparatus is a hollow article made of thermoplastic resin and integrally formed by blow molding , comprising a first wall and a second wall confronting across a spacing . there is an integral rib between the first wall and the second wall , wherein the integral rib comprises a flat rib between the walls and one or more hollow ribs adjacent to each of two side ends of the flat rib . the impact absorbing rib is disposed at intervals and in an impact action direction . the rib is uniform in shape , dimensions and wall width , and free from reduction of wall width of the inner rib , yet possessing proper structural support and mechanical strength , and excellent in impact absorbing performance .