Monodispersed albumin gel microcapsules were produced by heat treatment of W/O (water in oil) emulsion which is prepared from albumin solution and decane containing tetraglycerin condensed ricinoleic ester as a surfactant using microchannel emulsification. The average size, standard deviation and geometric standard deviation of the gel microcapsules are 20 mu m, no more than 1 mu m and no more than 1.05, respectively, which are almost the same as those of W/O emulsion droplets.