The effect of the overburden pressure during curing on the unconfined compressive strength of cement-stabilized soils was examined using a newly developed apparatus, which could apply an overburden pressure below 150kPa to a cement-stabilized soil under an one-dimensional consolidation condition. The test results showed that the unconfined compressive strength of the cement-stabilized soil increased linearly with the increase of overburden pressure. The cement-stabilized soil cured under the overburden pressure showed a brittle shear behavior as compared with that cured soil under no overburden pressure. Furthermore, scanning electron microscope observations clarified that the cement-stabilized soil cured under the overburden pressure had a very stiff microstructure.