Udagawa Kazuo was a bronze sculptor based in Tokyo. Between 1900 and 1910 he exhibited regularly at domestic and international expositions, including the St. Louis exposition in 1904. He was a member of Tokyo Chokokai (Tokyo Sculptors Association) and was also known for his ivory carvings.
For another example of Udagawa Kazuo's work, see Joe Earle, Splendors of Imperial Japan: Arts of the Meiji Period from the Khalili Collection (London: The Khalili Family Trust, 2002), p. 376, fig. 269.