Supreme Court Judge

On February 9, 1940, he was appointed to the Supreme Court of Canada, filling the vacancy created by the death of his former law partner, Lawrence Cannon.^{[citation needed]}

In 1946, he and fellow Justice Roy Kellock conducted the Royal Commission on Spying Activities in Canada that had been prompted by the Gouzenko Affair.^{[citation needed]}

Taschereau was promoted to Chief Justice in 1963.^{[citation needed]}

Under the Letters Patent, 1947, the Chief Justice of Canada serves as the Administrator of the Government of Canada in the death, absence or incapacity of the Governor General of Canada.^[2] Taschereau served as Administrator from the death of Governor General Georges Vanier on March 5, 1967 until April 17, 1967 when the Queen appointed Roland Michener as the new governor general, on the advice of Prime Minister Lester Pearson.^[3]

Retirement and honours

Taschereau remained on the Supreme Court until retiring in 1967.^{[citation needed]}

In 1967 he was made a Companion of the Order of Canada.^{[citation needed]}

Robert Taschereau died in 1970 at the age of 73, and was interred in the family plot at the Cimetière Notre-Dame-de-Belmont in Sainte-Foy, Quebec.^{[citation needed]}