A Coulomb explosion in a benzene molecule induced by an intense femtosecond laser field has been studied using the method of time-of-flight mass spectrometry. The laser intensity region of a Ti:sapphire laser was from 2.9 X 10(16) to 1.8 X 10(17) W cm(-2). Major ions were found to be multiply-charged carbon atoms, while the ion intensities of benzene fragments were small. The initial kinetic energy releases of Cq+ (q = 1 similar to 4) ions increased with increases in laser intensity, reaching 330 eV for the C4+ ion at 1.8 X 10(17) W cm(-2). A critical structure of the Coulomb explosion, where the charges are non-uniformly distributed and the structures an expanded slightly, has been postulated to explain such great energies of the multiply-charged ions.