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Koinobori and Children's Day

By the koi.wiki editorial team · Updated

Key facts: Koinobori (鯉のぼり) are carp-shaped windsocks flown in Japan to celebrate Tango no Sekku (端午の節句), now observed as Children’s Day (子供の日, Kodomo no Hi) on May 5[1].
Koinobori are made by painting carp patterns on paper, cloth, or nonwoven fabric so that they flutter and swim in the wind when flown from a pole[1]. They are also called satsuki-nobori (皐のぼり)[1]. Landscapes across Japan are decorated with koinobori from April to early May in honor of children, with the hope that they will grow up healthy and strong[1].The custom is closely tied to Children's Day, a national holiday designated in 1948 that falls on the last day of Golden Week[2][1]. The day traces back to Tango no Sekku, one of five annual ceremonies at the imperial court, originally celebrated on the fifth day of the fifth lunar month[2].

Origins and history

Tango no Sekku was originally a day for women to purify the home by thatching roofs with irises and to rest, but it shifted to a boys' observance during the Kamakura period (1185–1333) once the samurai class took power, since the word for iris, shōbu (菖蒲), shared its sound with shōbu (尚武), meaning to value military affairs[2]. During the Edo period (1603–1867), samurai households decorated their yards with nobori or fukinuke flags colored with family crests (mon) to represent military units; these merged into the first koinobori, which appeared in Edo (now Tokyo)[1][2]. According to a Japanese-language source, a Edo-period merchant is said to have replaced a small decorative pennant with a carp motif drawn from the Chinese legend of the dragon gate, and this design gradually grew larger into the koinobori known today[3].The colorful koinobori familiar today became popular during the Meiji era (1868–1912)[1][2]. Originally exclusive to samurai households, the custom eventually spread to the rest of the population[1]. Until 1948 the holiday was known as Boys' Day, with one carp flown for each son, while girls had a counterpart celebration in Hinamatsuri (Doll's Day); after the 1948 redesignation as Children's Day, some families began flying koinobori for every child regardless of gender, though many households still do not fly them for daughters[1][2].

The dragon gate legend

The symbolism of koinobori draws on the Chinese legend of Longmen (the dragon gate), from the late Han dynasty, in which a golden carp swam up a waterfall at the end of the Yellow River and transformed into a dragon[1]. A koi's ability to swim upstream is said to represent courage, determination, and the hope that children will grow up healthy[1]. According to the Japanese-language source, a related account attributes the first carp-shaped streamer in Edo to a samurai who had a dyer paint a carp design after seeing a commoner's child wish to display the type of banner only samurai families were permitted to fly[3].According to the US importer Kodama Koi Farm, the same legend appears in other Japanese traditions, including the Koi Yama float at Kyoto's Gion Matsuri festival, and is said to inspire the symbolism behind koinobori as well as ukiyo-e prints and irezumi tattoo art depicting a koi leaping toward a waterfall[4]. This source also describes a convention in which an upward-swimming koi in art represents someone still working toward a goal, while a downward-swimming koi suggests achievement[4][5]. Readers interested in how this imagery carries into decorative and body art can see Koi in art and tattoos and Koi in culture and symbolism.

Streamer colors and family meaning

Traditionally, a koinobori set included a black carp (真鯉, magoi) representing the father, followed by a smaller red carp (緋鯉, higoi) representing the eldest son[1]. If a household had more boys, additional blue, green, and, depending on region, purple or orange carp were added[1]. According to the Japanese-language source, the earliest koinobori were a single black carp, with a red carp added from the late Meiji into the Taishō period, and a smaller blue carp introduced later, after which the red carp came to represent the mother and the blue carp a child, with green, pink, and purple carp subsequently added for siblings[3].After Children's Day was redesignated in 1948 to celebrate both boys and girls, the red carp came to represent the mother of the family, sometimes shown as pink, while other colors and sizes came to represent all the family's children regardless of gender[1][2]. Today, koinobori are commonly flown above the roofs of houses with children: the largest (black) carp for the father, the next largest (red or pink) for the mother, and additional smaller carp of different colors for each child, arranged in decreasing order by age[1][2].

Construction and display

A typical koinobori set, from the top of the pole down, consists of a pair of arrow-spoked wheels (矢車, yaguruma) with a ball-shaped spinning vane, a mounting windsock (吹流し, fukinagashi), and then the carp streamers themselves[1]. Two main kinds of windsock are used above the carp: the five-colored windsock (五色吹流し), based on the five elements of Chinese philosophy, and patterned windsocks (柄物吹流し) often featuring a family crest (mon, 家紋)[1].Koinobori range from a few centimeters to several meters long[1]. In 1988, a 100 m (330 ft) long koinobori weighing 350 kg (770 lb) was made in Kazo, Saitama[1][3]. They were originally made by hand-painting paper or cloth, but synthetic materials have largely replaced these outside some rural areas, with silk and paper versions still sold at higher prices[1].Related Tango no Sekku traditions include kite-flying and kite-fighting, the display of samurai dolls and miniature armor and helmets (kabuto) known as Gogatsu Ningyo, bathing with irises, and eating kashiwa mochi (rice cakes wrapped in oak leaves) and chimaki, as well as drinking shōbu-sake made with iris root[1][2]. In some areas, young boys are made to crawl through the koinobori for good fortune[1]. The custom of displaying mini armor and kabuto originated between the Kamakura and Muromachi periods, when samurai took their armor out of storage in May to care for it before the rainy season and began displaying it for their children's protection[2].The tradition of displaying miniature armor shifted from samurai dolls to miniature armor in the Shōwa era, and toward smaller kabuto alone since the 21st century, likely reflecting the size of modern Japanese homes[2]. A widely sung koinobori song, with lyrics by Miyako Kondō, was published in a 1932 picture songbook[1].

Regional festivals and modern koinobori

The same source describes regional events such as 3,500 koinobori raised at Tsuetate Onsen in Kumamoto Prefecture, carp streamers floated on the Niyodo River using water-resistant washi in Kōchi Prefecture, and illuminated underwater displays of 200 koinobori on the Asano River in Kanazawa[3]. Tatebayashi in Gunma Prefecture holds a festival flying more than 5,000 koinobori across four sites, a number recognized as a Guinness World Record in 2005[3].In 2014, the Japan Koinobori Association reportedly presented koinobori to the British royal family to mark Prince George's first Tango no Sekku, and they were flown in the Japanese garden at Holland Park near Kensington Palace[3].

Koi symbolism in wider culture

In Japan the koi is regarded as a symbol of luck, prosperity, good fortune, and perseverance in the face of adversity, and ornamental koi are closely associated with national identity[6]. The koinobori custom, which began in the Edo period, remains part of this broader symbolic role and continues to be displayed in gardens on Children's Day[6][7]. In Chinese culture, the koi similarly represents fame, family harmony, and wealth, and is considered a feng shui favorite linked to abundance and the ability to transform into a dragon[6]. For broader context on these associations, see Koi in culture and symbolism and History of koi.

Common questions

What is the meaning of koinobori?
Koinobori are carp-shaped streamers flown for Children's Day; the carp's ability to swim upstream symbolizes courage and the hope that children grow up healthy, drawing on the Chinese legend of a carp that became a dragon after climbing a waterfall[1].
When are koinobori displayed?
They are typically displayed from April into early May, around Children's Day (Kodomo no Hi) on May 5, the last day of Golden Week[1].
Why are there different colored carp streamers?
The colors traditionally represent family members: black for the father, red or pink for the mother, and additional colors such as blue, green, or purple for each child, though the meanings have changed since Children's Day began including girls in 1948[1][2].
Is Children's Day the same as Boys' Day?
Children's Day was known as Boys' Day until 1948, when it was redesignated to celebrate the happiness of all children and recognize both parents[2].
What is the largest koinobori ever made?
In 1988 a 100 m (330 ft) long koinobori weighing 350 kg (770 lb) was made in Kazo, Saitama[1][3].

References

  1. ^ Koinobori (Wikipedia). Wikipedia. en.wikipedia.org/wiki/Koinobori. Retrieved November 2026.
  2. ^ Children's Day (Japan) (Wikipedia). Wikipedia. en.wikipedia.org/wiki/Children's_Day_(Japan). Retrieved November 2026.
  3. ^ こいのぼり (Wikipedia). Wikipedia (Japanese). ja.wikipedia.org/wiki/鯉のぼり. Retrieved November 2026.
  4. ^ The Koi Dragon Legend: The Myth of the Dragon Gate. Kodama Koi Farm (koi dealer). kodamakoifarm.com/koi-dragon-legend/. Retrieved November 2026.
  5. ^ Koi in Art & Literature: Dive into Their Enduring Presence. Kodama Koi Farm (koi dealer). kodamakoifarm.com/koi-in-art-literature/. Retrieved November 2026.
  6. ^ Koi (Wikipedia). Wikipedia. en.wikipedia.org/wiki/Nishikigoi. Retrieved November 2026.
  7. ^ Koi (Wikipedia). Wikipedia. en.wikipedia.org/wiki/Koi. Retrieved November 2026.