Around the rotary on the west exit, there are several benches that can seat three people.
I thought they were for taxis or buses, but they are located at the drop-off area for general vehicles, so it seems you can use them freely.
Introducing the rest area "Iwakuni Station | West Exit Rotary Area | Rest Spot" at 1 min walk from iwakuni Station.
Introducing the rest area "Iwakuni Station | West Exit Rotary Area | Rest Spot" at 1 min walk from iwakuni Station.