Hokora are small roadside shrines found all over Japan.
Often the doors are closed, but sometimes they are open and one can see the shintai which is usually a stone, sometimes a small statue.
This one I found in a village in southern Okayama is obviously a small fertility shrine.
They were much more common in earlier days, though one can still find them in the countryside.
Each carving would have been made by a local person to ask the kami for a baby.