He represented Madawaska County in the Legislative Assembly of New Brunswick from 1935 to 1952 and Restigouche—Madawaska in the House of Commons of Canada as a Liberal member from 1953 to 1955.

He worked as an agronomist for some time before moving to Edmundston, New Brunswick in 1920 where he became manager of the Royal Hotel acquired by his father.

Gaspard Boucher was involved with the Société nationale des Acadiens and was one of the founders of the New Brunswick chapter of the Ordre de Jacques Cartier, an organization dedicated to defending the rights of Francophones.

Gaspard aided in the establishment of credit unions in the Madawaska region and the Knights of Columbus branch in the city of Edmundston.

Boucher served in the province's Executive Council as a minister without portfolio from 1941 to 1949 and as Provincial Secretary-Treasurer from August 10, 1949 to October 8, 1952.