We calculate the electric dipole moment (EDM) of the nuclei 7 Li and 11 B in the cluster model with α ( 4 He) and triton ( 3 H) clusters as degrees of freedom. The 7 Li and 11 B nuclei are treated in the two-and three-body problem, respectively, using the Gaussian expansion method, assuming the one meson exchange P, CP-odd nuclear forces. We find that 7 Li and 11 B have larger sensitivity to the CP violation than the deuteron. It is also suggested that the EDMs of 7 Li and 11 B, together with those of 6 Li, 9 Be and the 1/2 + 1 excited state of 13 C, obey an approximate counting rule accounting for the EDM of the cluster and the α − N polarization. We show their sensitivity on the hadronic level CP violation in terms of the chiral effective field theory, and discuss their role in probing new physics beyond the standard model.