To the right of the main shrine is the main shrine of Kasuga Shrine, which is a subsidiary shrine of Itsukushima Shrine.This is the original main shrine of Itsukushima Shrine that was relocated when the old shrine of Kasuga Taisha Shrine in Nara was taken over as the main shrine of Itsukushima Shrine at the end of the Edo period. The date of construction is unknown, but it is estimated to be from the middle to late Muromachi period based on the architectural style. It is built in the Ikkensha style and has a cypress bark roof, giving it regional characteristics that are slightly different from those in southern Osaka due to its proximity to Kyoto Prefecture. The main hall of Kasuga Shrine, a subsidiary shrine of Itsukushima Shrine, was designated as a national important cultural property in 1978.