Abstract: A particulate material feeder includes a hopper sectioned into two receptacles for accommodating two different kinds of particulate materials. Each particulate material falling down through a bottom opening of the receptacle is introduced into a feed channel defined between a feed roller having a frictional periphery and a control gate having a semi-circular cross-section. Thus, a pair of feeding systems for two different kinds of the particulate materials are symmetrically provided within a single apparatus. An opening degree of the feed channel may be controlled separately and independently in each feeding system so that a definite mixing rate of the two kinds of particulate material can be obtained as desired. On the contrary, the feed rollers provided in the two feed systems are driven by a single driving source and are thus rotated at the same speed.