Koi-nobori was originally a custom that started among the families of affluent common people in the middle of the Edo period, as did Kadomatsu (New Year's pine decoration) and Hina-ningyo (a doll displayed at the Girls' Festival).
そもそも、鯉幟は門松や雛人形と同じく、江戸時代中期の裕福な庶民の家庭で始まった習慣であった。