In view of the importance of sizing of potatoes for seed and table purposes and absence of any satisfactory machine of indigenous make, a project was undertaken to design and develop a wire-belt type of potato sizer capable of sizing the tubers into four sizes. The note reports the constructional details and test results of the performance of prototype which was operated with a 2 H.P. electric motor, The output was found to be 20-24 quintals per hour with 1-1% of bruising percentage-and about 94% of sizing efficiency