The photophysical properties of a carbonyl-containing carotenoid analogue in an s-cis configuration, relative to the conjugated π system, 2-(all-trans-retinylidene)-indan-1,3-dione (C20Ind), were investigated by femtosecond time-resolved spectroscopy in various solvents. The lifetime of the optically forbidden S 1 state of C20Ind becomes long as solvent polarity increases. This trend is completely opposite to the situation of S 1-ICT dynamics of carbonyl-containing carotenoids, such as peridinin and fucoxanthin. Excitation energy dependence of the transient absorption measurements shows that the transient absorption spectra in non-polar solvents were originated from two distinct transient species, while those in polar and protic solvents are due to a single transient species. By referring to the results of MNDO-PSDCI (modified neglect of differential overlap with partial single-and double-configuration interaction) calculations, we conclude: (1) In polar and protic solvents, the S 1 state is generated following excitation up to the S 2 state; (2) In non-polar solvents, however, both the S 1 and 1 nπ * states are generated; and (3) C20Ind does not generate the S 1-ICT state, despite the fact that it has two conjugated carbonyl groups.