Yes, but in the very unlikely event of finding an unpolarized socket in JP you are out of luck because the Home Depot 59 cent adapter has polarized output prongs. If you want to be 100% safe get a multiadpater brick. It accepts any plug input and then you select the output side: UK/Euro/US&OZ. (Oz works by rotating the US prongs.)

Come to think of it, I think the socket built into a desk of a business hotel in JP may have been unpolarized.