| abstract |
An oxygen storage material comprises a La—Co—Al-based composite oxide containing lanthanum, cobalt and aluminum. The La—Co—Al-based composite oxide is in a form in which at least part of the aluminum is solid-dissolved in a La—Co composite oxide having a perovskite structure, and has a composition expressed by the following chemical formula (1):n nLaCo y Al x O δ (1)n nwhere x and y are numbers satisfying conditions of 0<x <1 and 0<y<1, where x+y=0.5 to 1.5, and δ is a number of 1.5 to 4.5. |