Perovskite complex oxide and catalyst

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A perovskite complex oxide is provided whose ratio of thermogravimetric weight decrease between 50 °C and 180°C to thermogravimetric weight decrease between 50 °C and 1000 °C is not less than 30 % and which contains, for example, one or more rare earth element species and one or more transition metal elements. Among perovskite complex oxides represented by structural formula RTO 3 , ones in which R is constituted by one or more rare earth element species and T is constituted by one or more transition metal elements, and ones in which R is constituted by one or more rare earth element species and one or more members selected from the group comprising alkali metal elements and alkali earth metal elements and T is constituted by one or more transition metal elements are excellent for use. A "rare earth element species" is defined as a member of the group of elements obtained by adding Y to the rare earth elements. The perovskite complex oxide is an excellent carrier for a vehicle exhaust gas purification catalyst that imparts catalytic activity in the low-temperature region.