Vacuum consolidation is a soft ground improvement method. The vacuum consolidation of soil above the groundwater level (unsaturated soil) has not been sufficiently examined in earlier studies. Thus, in this study, laterally confined vacuum consolidation tests were conducted for unsaturated clay slurry with Sr ≈ 80%. During the tests, the air bubbles on the sides of the specimens were recorded, and the water content and diameter were measured at the end of the tests. Surcharge consolidation and consolidation tests of saturated clay slurry were also conducted. Main conclusions are as follows: Surcharge consolidation of unsaturated clay slurry is one-dimensional. Although the settlement curves and water content distribution curves of unsaturated clay slurry under vacuum consolidation and surcharge consolidation are almost identical, lateral shrinkage is observed and the deformation is three-dimensional.