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A half-filled-band Hubbard model on an anisotropic triangular lattice (t intwo bond directions and t' in the other) is studied using an optimizationvariational Monte Carlo method, to consider the Mott transition andsuperconductivity arising in \kappa-BEDT-TTF_2X. Adopting wave functions withdoublon-holon binding factors, we reveal that a first-order Mott(conductor-to-nonmagnetic insulator) transition takes place at U=U_capproximately of the band width, for a wide range of t'/t. This transition isnot directly connected to magnetism. Robust d-wave superconductivity appears ina restricted parameter range: immediately below U_c and moderate strength offrustration (0.4\lsim t'/t\lsim 0.7), where short-range antiferromagneticcorrelation sufficiently develops but does not come to a long-range order. Therelevance to experiments is also discussed.Comment: 15 pages, 17 figures, submitted to J. Phys. Soc. Jp

Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice