The heavy rock is the object of worship of Koseishizuchi Shrine, and is a huge rock that maintains an exquisite balance so as not to fall into the cliffs on the mountain. From Shigeiwa, you can also see the spectacular view of the Seto Inland Sea below.

It seems that it is not known whether it was made naturally or layered by human hands.
The mysterious rock that looks like it will not fall is also popular as a power spot.

It is located about 200 steps up the stairs from the parking lot.