A compact roller hemming device which can perform a hemming process with respect to various works. The roller hemming device for hemming a work includes rotary shafts rotating on axes thereof, and first lower dies and second lower dies on which the corresponding work is placed. The first lower dies and the second lower dies are arranged on outer circumferential parts of the rotary shafts at predetermined intervals. The rotary shafts rotate so that one each of the first lower dies and the second lower dies is selected depending on a type of the work to be hemmed.