The shrink-fitted assembly between a ceramic shaft and a metal ring with a hybrid shrink fitter which contains liquid has been analyzed as a three-dimensional elastic problem. Water was used as the liquid contained in the hybrid shrink fitter because its thermal expansion at elevated temperatures and under high pressures has been investigated in detail. Contact pressures of the three-dimensional analysis were compared with those of the two-dimensional analysis calculated in a previous paper. An amount of Si₃N₄ powder was mixed with the contained water to reduce the internal pressure of the casing because the internal pressure became fairly high at elevated temperature in the case in which the casing contained only water. Materials used in calculation were Si₃N₄ for the shaft, SUS 403 for the metal ring and SUS 304 for the casing of the hybrid shrink fitter. The contact pressures at central parts of the inner and outer contact interfaces increased with temperature. This tendency of the contact pressure was similar to that of the two-dimensional analysis. The contact pressure at peripheral parts of the contact interface decreased with temperature. The stress of the casing was higher compared with the two-dimensional analysis at the same volume ratios of Si₃N₄ powder to water.