Since ancient times in Japan, people traditionary hold the boy's festival to drive away evil spirits on May fifth-Tango-. In Edo period samurai family displayed banners and military armors to celebrate their heir and ordinary citizens also followed this custom. Later on the hand-made miniature warrior-doll-helmets were displayed among ordinary citizens.

 The custom to display helmet and armors, and May dolls representiry brave samurais or healthy boys on May fifth originally comes from the above custom.