It is the name of an object that pull or carry in the Japanese religious festival.
There are many different kinds of special festival around Japan depends on the cultural in the area.
Omikoshi has different kinds of design in each places.
In “Kishiwada no danjiri” festival, the omikoshi followers will smash into each other which called “Kenka Mikoshi”. They will carry the omikoshi with great speed and run around the city in Kishiiwada place. It is a well-known festival in Japan.