The pelvis (plural: pelves) is a set of bones. Many people think of the pelvis as the hip bone, because it is at the hip. The pelvis is at the lower end of the spine.In vertebrates, the legs are attached at the pelvis. The function of the pelvis is to protect the organs used for digesting and for reproduction (making babies).It is also important for bearing some load.he pelvis is at the lower end of the spine. In vertebrates, the legs are attached at the pelvis. The function of the pelvis is to protect the organs used for digesting and for reproduction (making babies).