A method for manufacturing a flexible electrophoretic display device, including: providing a metal mother substrate having a first thickness, including a unit display panel region and a non-display region adjacent the unit display panel region; forming a display element in the unit display panel region; forming a groove in the non-display region of the mother substrate; cutting the mother substrate along the groove to separate the unit display panel region from the mother substrate; thinning the substrate of the separated unit display panel region; and forming an electrophoretic ink film on the unit display panel region.