Matsushima was the founder of Sanritsu Confectionary Co.
Since he began his rock candy business in 1913, he was looking for a way to use molasses made in the process of making rock candy. Kompeitō was unpopular because it was too expensive then. Thus, he decided to invent a machine to produce it effectively.
He founded Sanritsu Confectionary Co in 1921 when he succeeded on creating the machine. The company grew rapidly and built a factory in Tokyo in 1931. In contrast to rumors that they would fail, animal shaped biscuits were a great hit.
"Hamamatsu Sangyōshi"(the History of Hamamatsu's Industry)
"Enshū Ijinden Daisankkan" (Stories of Great Figures of Enshū vol.3)
"Okashi to Tomoni Sanritsu Seika 70 Nen no Ayumi" (70 Years of Sanritsu Confectionary with Sweets)