A method for manufacturing an over-current protection device comprises a step of providing at least one current sensitive device and a step of pressing. The current sensitive device comprises a first electrode foil, a second electrode foil and a PTC conductive layer physically laminated between the first and second electrode foils. The pressing step is to press the current sensitive device at a predetermined temperature, thereby generating at least one overflow portion at sides of the PTC conductive layer to form the over-current protection device. The predetermined temperature is higher than the softening temperature of the PTC conductive layer. The over-current protection devices manufactured according to the present invention have superior resistance distribution.