We prepared enantiomers of chiral Pt(II) complexes, Pt(pppb)Cl and Pt(pppb)CN (pppbH = 1-pyridyl-3-(4,5-pinenopyridyl)benzene), and measured their CPL (circularly polarized luminescence) spectra for excimer and trimer emission. The contribution of pinene moiety to CPL was considerably low for the pi-pi^* emission of monomer but large for MMLCT (metal-metal-to-ligand charge-transfer) of excimer and trimer which had helical structure induced in face-to-face stacking fashion. The trimer CPL for (+)-Pt(pppb)Cl was larger in intensity than excimer CPL, on the other hand, that for (+)-Pt(pppb)CN was opposite in sign compared with the excimer CPL. We concluded that the variation in the CPL spectra was accounted for the difference in excited-state structure of aggregate between Pt(pppb)Cl and Pt(pppb)CN. It was predicted by an aid of TD-DFT calculation that the dihedral angle q(Cl-Pt-Pt-Cl) was 50 – 60° or 110 – 140° for Pt(pppb)Cl aggregates and 160° for Pt(pppb)CN aggregates.