Scaler mesons in a chiral quark model with 't Hooft interaction

In a chiral quark model of the Nambu-Jona-Lasinio type with 't Hooft intera ction, we calculate the mass spectra of pseudoscalar and scaler masons. We obtain a satisfactory result for the pseudoscalar masons. The 't Hooft inte raction increases, to some extent, the scalar-meson masses, but this increa se is not sufficient to explain the entire scalar-mass spectrum. The situat ion could be improved for the sigma and f(0) mesons through mixing with the glueball state. In order to describe the masses of a(0) and K-0* mesons, i t is necessary to invoke other models. The strong-decay widths of the scala r mesons are described.