Go to the Marunouchi North exit (丸の内北口) to find this prayer room. One of the cleanest prayer rooms I have ever experienced. Ask the staff there to open the room for you… they are very kind so don’t hesitate to do ask.

Inside the the large JR ticket center near Marunouchi North Entrance

You might have to walk a bit to locate this place

The place closes are 7 PM You have to ask the staff across the hall. I arrived just five minutes late. But it is a great service for those looking for a decent place to offer prayers. Thank you JR East

This so the entrance of the ticket office