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Calculations are made with an RG-improved action for gluons and improved Wilson action for quarks at $a^{-1}=1.207(12) {\\rm GeV}$ on $16^3 \\times 80$, $20^3 \\times 80$ and $24^3 \\times 80$ lattices. We investigate the validity of necessary condition for application of L\\\"uscher's formula through the wave function. We find that the condition is satisfied for lattice volumes $L\\ge 3.92 {\\rm fm}$ for the quark mass range $m_\\pi^2 = 0.273-0.736 {\\rm GeV}^2$. 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