A combustion fan installation structure of a gas radiation oven range is disclosed in which a combustion fan (200) is coupled at a space outside a space where a radiant burner (40) is positioned. Since the temperature of the sucked air for combustion is constantly maintained, an air with a sufficient air density can be supplied. Thus, it can have a stable combustion performance. In addition, an influence of the temperature change generated when the oven or the grill is operated can be excluded. Accordingly, a reliability of a combustion performance of the gas radiation oven range to be mainly used in kitchens or in hotels can be improved.