[en] The structures of the light p-shell hypernuclei ⁶_ΛHe, ⁷_ΛLi, ⁹_ΛLi and ⁹_ΛBe are studied by using a realistic effective ΛN interaction (YNG), and compared to those with the use of the simple one-range Gaussian (ORG) interaction. The YNG interaction, which simulates the ΛN G-matrix for the Nijmegen OBE model D, is characterized by the inner repulsive core and the density-dependence along with the space-exchange and spin-spin components. The framework we adopt is the microscopic α+x+Λ (x=n, d, t or α) three-cluster model, where nucleon antisymmetrization is exactly treated. The characteristic behaviors of Λ-x and Λ-(αx) interactions derived from the YNG are displayed and discussed. In spite of the remarkable characteristic of YNG, the calculated energy levels of the four hypernuclei are very similar to those previous obtained by using the simple ORG interaction. The stabilization and contraction of the hypernuclear system due to the glue-like role of Λ-particle persists in the present calculation, though the repulsive core of the ΛN interaction tends to prevent from too much contraction. (orig.)