To provide a production process for carbonyl compounds in high yield starting from corresponding nitrile compounds, provide a production process for a carbonyl compound bearing the carbonyl group converted from a specific cyano group in a polynitrile compound in high yield and provide a microorganism that catalyzes these reactions.

This production process for a carbonyl compound is characterized by using a microorganism in Burkholderia as a catalyst to convert a cyano group (CN) in a nitrile compound to a carbonyl group (COY) (Y is NH2 or OH). The microorganism in Burkholderia is also a new catalyst to be used in the reaction.