國學院大學
In his later years, Sasaki was known for his conservative political views. He was instrumental in the creation of the Jingi-in, the government body heading the State Shinto religion. He was also associated with Nishimura Shigeki in promoting patriotic education and emperor worship in the public school curriculum. He was one of the founders of the Kōgaku-in (later Kokugakuin University). In 1909, he title was elevated to that of marquis ("kōshaku"). He died in 1910, and his grave is at the Aoyama Cemetery in Tokyo.