The gum types used were xanthan,guar,locustbean, k-carrageenan and xanthane-guar blend. Cake containing no gum was used as control. It was observed that both addition of different types of gums affected the pore area fraction and percent number of pore of the rice cakes.The highest pore area fraction was obtained in cakes containing xanthan and xanthane-guar blend.Cakes baked in IR-MW combination oven had higher porosity than those bake in conventional oven. Micro-structure of gluten-free rice cakes was also analyzed. According to these results, conventionally baked cakes showed more starch granule deformations. Both granular starch residues and deformed starch structure were observed together in cakes baked in IR-MW combination oven. All of the starch granules did not lose their identity and did not disintegrate completely.