You can flush used toilet paper down the toilet, but...
In all regions of Japan you can flush used toilet paper down the toilet, at wash rooms in hotels, ryokans (Japanese inns), department stores, restaurants, trains stations, road stations, public facilities and home.
This rule varies in each country of Asia. There are some countries where you are not allowed to flush used toilet paper and other disposals. You should be aware of it and check beforehand if you tour around Asian countries other than Japan.
So, what you should know is,
In Japan you can flush only used toilet paper down the toilet. Other non-water-soluble disposals, such as sanitary napkin or tissue paper, are to throw away in a small bin placed in each toilet room.
The bin is called Sanitarii (sanitary) Box or Echiketto (etiquette) Box in Japanese
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