Sato Hachiro was a Japanese poet, nursery rhyme lyricist, and writer born in Ichigayayakuoji-mae-cho, Ushigome-ku, Tokyo. He dropped out of junior high school. Hs father is writer Sato Koroku.

He lived with Fukushi Kojiro, a poet who was a disciple of his father, on Chichijima in the Ogasawara Islands, and was influenced by him. In 1919, he became a disciple of Saijo Yaso and began making nursery rhymes with the introduction of Fukushi, and was published in numerous magazines and the Yomiuri Shimbun. In 1926, he published his debut poetry collection "Tsumeiro no Ame".

Since the 1930s, he has been actively writing not only nursery rhymes and poetry, but also novels and movie theme songs. In 1938, he signed an exclusive contract with Nippon Columbia. He also wrote lyrics for wartime songs such as "Shori no Hi Made".

When the war ended, he wrote the lyrics for "Ringo no Uta", which is the theme song and insert song of the movie "Soyokaze". It became a popular song, and became a symbol of Japan under the occupation of the Allied Forces.

In 1955 he wrote the lyrics for "Chiisai Aki Mitsuketa", and won the Children's Song Award at the Record Awards in 1962. He also received the NHK Broadcast Culture Award in 1963, and the Medal with Purple Ribbon in 1966.

In 1973, at the age of 70, when he received the Order of the Sacred Treasure, he died of a heart attack at St. Luke's International Hospital.