Organic substance decomposition catalyst and organic substance decomposition apparatus

An organic substance decomposition catalyst used for decomposing an organic substance, the organic substance decomposition catalyst comprising:

• a perovskite-type complex oxide denoted by a formula AxByMzOw in which
• A includes Ba,
• B includes Zr,
• M represents Mn and Co,
• a composition ratio of Mn to Co is represented by Mn:Co=z1:z2,
• z=z1+z2,
• y+z=1.000,
• 0.100<z1+z2≤0.200,
• 0.00<z1/(z1+z2)<0.75,
• w represents a positive value satisfying electrical neutrality,
• 1.000≤x/(y+z)≤1.050,
• the organic substance decomposition catalyst has a specific surface area of 7.2 m2/g or more, and
• an integral width of the peak intensity of a (222) face of the organic substance decomposition catalyst in X-ray diffraction measurement is in a range of 0.622° or more.