According to latest news published in bcnranking.jp, the 600D / T3i is best selling DSLR in Japan, the second ranking goes to Nikon D3200 and third is Nikon D5200.
Top selling mirrorless camera in Japan is Sony NEX 5R, second in list is Canon EOS M and third is OLYMPUS PEN Lite E-PL5.
The best selling FullFrame camera is Canon 6D, take a look at the chart below after this break
src-bcnranking.jp