Roussel was born in Paris, the third and last child in his family, with a brother Georges and sister Germaine. In 1893, at age 15, he was admitted to the Paris Conservatoire for piano. A year later, he inherited a substantial fortune from his deceased father and began to write poetry to accompany his musical compositions. At age 17, he wrote "Mon Âme", a long poem published three years later in "Le Gaulois". By 1896, he had commenced editing his long poem "La Doublure" when he suffered a mental crisis. After the poem was published on June 10, 1897 and was completely unsuccessful, Roussel began to see the psychiatrist Pierre Janet. In subsequent years, his inherited fortune allowed him to publish his own works and mount luxurious productions of his plays. He wrote and published some of his most important work between 1900 and 1914, and then from 1920 to 1921 traveled around the world. He continued to write for the next decade, but when his fortune finally gave out, he made his way to a hotel in Palermo, where he died of a barbiturate overdose in 1933, aged 56. He is buried in Père-Lachaise cemetery in Paris.