In the paper, the content of inositol tris-, tetrakis-, pentakis-, and hexakisphosphate in dry seeds of five bean (Phaseolus vulgaris L.) cultivars was determined, and the effect of extrusion parameters on the content of those compounds was defined. IP₃ was not detected in dry bean seeds yet IP₆ was a dominant form in them. The extrusion process caused IP6 to hydrolyze and the other phosphates to increase in their amounts. The lowest increase in the contents of IP₃, IP₄, and IP₅ and the lowest losses in the IP₆ content were found in the extrudates produced at an initial humidity of the raw material amounting to 20% and at a temperature of 120°C, and the highest losses in the IP₆ content – at 14% of humidity, and at a temperature of 180°C.