What Are Koinobori?

Koinobori (carp wind socks) fly on Children's Day, こどもの日, May 5th, to wish kids the strength to swim upstream through life's challenges. There's something deeply comforting about koinobori and koinobori-themed items. They carry my culture and childhood within them, and they are simply beautiful.

Originally, the Japanese holiday was called Boy’s Day (Tango no Sekku), but in post-war Japan in 1948, the day became an official holiday to celebrate all children and was thus renamed Children’s Day. Growing up in Hawaii in the 70s, I knew May 5th as Boys Day, the counterpart to March 3rd Girls Day. Perhaps because the tradition came to Hawaii in the 1800s, the older name stuck. Since my sister and I were both girls, I definitely had less of an affinity for Boys Day but always coveted the beautiful, colorful Koinobori flying in honor of boys. I do appreciate the modernization of the holiday to wish all children strength and courage! 

What Are Koinobori?

Koinobori are fabric wind socks shaped and painted to look like koi fish. They are strung on tall poles outside homes and public spaces throughout Japan in the weeks leading up to May 5th. Families traditionally fly one fish per child, with the largest representing the father, the next representing the mother, and the smaller ones representing each child in the household. Catching the wind, they ripple like something between a flag and a kite.

The koi fish holds deep symbolism in Japanese culture. Legend says the koi that successfully swims upstream and over a waterfall transforms into a dragon. By flying koinobori, families are sending a wish into the sky: that their children will be brave, resilient, and strong enough to face whatever currents life throws at them.