The swelling rates of amphiphilic N,N-dimethylacrylamide gel in various polar solvents were measured, and a method to estimate them simply from the volume fraction of the gel network, phi(e), in the solvent was examined. Gels were prepared with different monomer concentrations, and the swelling rates were measured in ten kinds of polar solvents at various temperatures. The swelling rates were evaluated by the collective diffusion coefficient of the gel network, D. The volume fractions of the gel network in these polar solvents ranged 0.039 to 0.23. First, an atempt was made to represent the collective diffusion coefficient by using the scaling law. The collective diffusion coefficient was proportional to Tphi(e)(3/4)/eta, where, T and eta are the temperature and the viscosity of the solvent, respectively. The proportionality constant was independent of the temperature of solvent and the gel composition but dependent on the kind of solvent. Next, an expression based on Flory's theory of elasticity was tried, and it was found that the collective diffusion coefficient, D was proportional to (Tphi(e)(1/3) phi(0)(2/3)) / (etaphi(e)(3/2)), where phi(0) is the volume fraction of the network in the random walk state. The proportionality constant was independent of the kind and temperature of solvent, while it was dependent on the gel composition. From these facts, it can be said that the swelling rate of amphiphilic gel in polar solvents can be estimated easily by using these two relationship in the range of phi(e) examined in this work.