Manufacturing method for unidirectional electromagnetic steel sheet

This manufacturing method for a unidirectional electromagnetic steel sheet comprises: a heating step of heating a slab having a predetermined chemical composition at a temperature T1oC of from 1150oC to 1300oC, maintaining the temperature for 5 minutes to 30 hours, decreasing the temperature of the slab to a temperature T2oC which is lower than (T1 - 50)oC, heating the slab to a temperature T3oC of from 1280oC to 1450oC, and maintaining the temperature for 5 minutes to 60 minutes; a hot-rolling step of hot rolling the heated slab to obtain a hot-rolled steel sheet; a cold-rolling step; an intermediate annealing step of performing intermediate annealing on the hot-rolled steel sheet at least once prior to the cold-rolling step or while temporarily interrupting the cold-rolling step prior to the final pass of the cold-rolling step; an annealing separator coating step; and a second coating film coating step. The cold-rolling step includes maintaining processes between multiple passes. One to four processes among the maintaining processes are performed at a temperature ToC that satisfies 170 + [Bi] x 5000 ≤ T ≤ 300. The heating rate in a decarburization step is 50oC/second.