Amino acid derived norbornene monomers having unprotected carboxy (1) and amino groups (2) and 7-oxanorbornene having ester groups (3) were block copolymerized using the Grubbs ruthenium complexes. In the combination of I and 2, block copolymers with number-average molecular weights ranging from 43 000 to 95 000 were obtained in good yields. Poly(1)(75)-block-poly(2)(25) was soluble in 0.5 M NaOH(aq) but insoluble in 0.1 M HCl, while poly(1)(25)-block-poly(2)(75) was soluble in 0.1 M HCl but insoluble in 0.5 M NaOH(aq). Thus, the block compositions remarkably affected the solubility of the copolymers in acidic and basic media. On the other hand, poly(2)(62)-block-poly(3)(38) was soluble in H2O but insoluble in CH2Cl2 and CHCl3, while poly(2)(38)-block-poly(3)(62) was soluble in CH2Cl2 and CHCl3 but insoluble in H2O. In this monomer combination, the block compositions significantly affected the Solubility of the copolymers in organic and aqueous media. H-1 NMR spectroscopic, turbidity, and dynamic light scattering measurements revealed that poly(1)(50)-block-poly(2)(50) formed micelles with a diameter around 130 nm in 0.5 M NaOH(aq). In a similar manner, it was revealed that poly(2)(62)-block-poly(3)(38) and poly(2)(38)-block-poly(3)(62) formed micelles with a diameter around 80 nm in H2O and reverse micelles with it diameter around 45 nm in CH2Cl2, respectively.