We analyze the B-11-NMR spectrum for H parallel to [001] in phase III of Ce
B6 quantitatively. The experimental results are reproduced by taking the su
m of the dipolar field and the transferred hyperfine field from the Cc site
. Their absolute values and also the magnitude of the antiferromagnetic mom
ent are estimated. These results show that the O-xy AFQ ordering in phase I
I continues to exist also in the AF magnetic phase III.