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Argiope amoena
Approximately 2.5 inches or 6.5 cm long.
Its web.
This is not Argiope amoena, but Bruennichi. Compare:
http://www.projectnoah.org/spottings/170...
Originally from Europe this spider is now also found in Japan:
http://www.flickr.com/photos/mangoverde/...
http://www.nhm.ac.uk/nature-online/life/...