We investigated transport properties and optical reflectivity of incommensurate misfit layer compounds (LaS) 1 . 1 6 VS 2 and (CeS) 1 . 1 9 (TiS 2 ) n (stage index n = 1, 2). Electrical conduction measurements revealed that (CeS) 1 . 1 9 (TiS 2 ) n is metallic while (LaS) 1 . 1 6 VS 2 is non-metallic. The existence of a short-range scattering process of the order of 10 was indicated for both electrons and phonons in (CeS) 1 . 1 9 (TiS 2 ) n , suggesting that the local lattice modulation induced by the incommensurate structure has an important contribution to the conduction of electrons and phonons. Optical reflectance spectra for (LaS) 1 . 1 6 VS 2 exhibited the enhancement of the carrier scattering, indicating a different character of the conduction band of (LaS) 1 . 1 6 VS 2 in comparison with metallic (CeS) 1 . 1 9 (TiS 2 ) n . We propose the possibility of carrier localization in (LaS) 1 . 1 6 VS 2 in relation to the incommensurate structure of these compounds.