By using the porous glass membrane method, we obtained a monodispersed emulsion. Effects of oil varying in droplet size and volume on the brittleness and brittleness strain (breakability after rupture of emulsion gels by a compressive force) of o/w emulsion gels were investigated by compressive measurement. Droplets ranged in size from 1·5 μ m to 12·2 μ m in diameter. Volume fractions were 0·1, 0·2 and 0·3. For each oil volume fraction, the brittleness of