Yoshizawa was born on 14 March 1911, in Kaminokawa, Japan, to the family of a dairy farmer. When he was a child, he took pleasure in teaching himself origami. He moved into a factory job in Tokyo when he was 13 years old. His passion for origami was rekindled in his early 20s, when he was promoted from factory worker to technical draftsman. His new job was to teach junior employees geometry. Yoshizawa used the traditional art of origami to understand and communicate geometrical problems.