Abstract: An apparatus for disintegrating lumps of boiled rice while cooling and freezing, comprising a cooling chamber and a freezing chamber through which boiled rice is caused to pass being carried on a mesh conveyor and thereby being cooled and frozen to a temperature from +10.degree. C. to -30.degree. C., and one or plurality of disintegrators disposed above and across the belt conveyor each comprising a rotary comb and a stationary comb both having a plurality of comb teeth disposed such that the teeth of the opposing combs are meshed with each other. In a preferred embodiment, the stationary comb of the disintegrator at the downstream of the mesh belt conveyor is disposed spaced apart from the belt conveyor by such a gap between the lower end of the comb teeth and the upper surface of the belt conveyor as allowing to pass only the individually disintegrated rice grains to pass therethrough.