A method of manufacturing a laminated core, comprising: laminating a plurality of core sheets to form a core body having a plurality of magnet insertion holes (12; 12a) in a circumferential direction, inserting permanent magnets into the respective magnet insertion holes (12; 12a), and injecting a resin from resin reservoir pots (17; 41; 44) into the magnet insertion holes (12; 12a) to fix the permanent magnets while holding the core body between an upper die (15; 40; 42) and a lower die, the reservoir pots (17; 41; 44) provided in one of the upper die (15; 40; 42) and the lower die, the method further comprising: placing a dummy plate (19; 43; 47) between the core body and the die (15; 40; 42) having the resin reservoir pots (17; 41; 44), the dummy plate (19; 43; 47) having gate holes (35; 35a; 50) guiding the resin from the resin reservoir pots (17; 41; 44) into the magnet insertion holes (12; 12a), each of the gate holes (35; 35a; 50) overlapping with both of a part of the magnet insertion hole (12; 12a) and a surface of the core body, pouring the resin into the magnet insertion holes (12; 12a) via the gate holes (35; 35a; 50) and curing the poured resin, separating the core body along with the dummy plate (19; 43; 47) from the die (15; 40; 42) having the reservoir pots (17; 41; 44), and removing the dummy plate (19; 43; 47) from the core body by subjecting the dummy plate (19; 43; 47) to a load to remove the resin overflowed from the magnet insertion holes (12; 12a). laminating a plurality of core sheets to form a core body having a plurality of magnet insertion holes (12; 12a) in a circumferential direction, inserting permanent magnets into the respective magnet insertion holes (12; 12a), and injecting a resin from resin reservoir pots (17; 41; 44) into the magnet insertion holes (12; 12a) to fix the permanent magnets while holding the core body between an upper die (15; 40; 42) and a lower die, the reservoir pots (17; 41; 44) provided in one of the upper die (15; 40; 42) and the lower die, the method further comprising: placing a dummy plate (19; 43; 47) between the core body and the die (15; 40; 42) having the resin reservoir pots (17; 41; 44), the dummy plate (19; 43; 47) having gate holes (35; 35a; 50) guiding the resin from the resin reservoir pots (17; 41; 44) into the magnet insertion holes (12; 12a), each of the gate holes (35; 35a; 50) overlapping with both of a part of the magnet insertion hole (12; 12a) and a surface of the core body, pouring the resin into the magnet insertion holes (12; 12a) via the gate holes (35; 35a; 50) and curing the poured resin, separating the core body along with the dummy plate (19; 43; 47) from the die (15; 40; 42) having the reservoir pots (17; 41; 44), and removing the dummy plate (19; 43; 47) from the core body by subjecting the dummy plate (19; 43; 47) to a load to remove the resin overflowed from the magnet insertion holes (12; 12a). placing a dummy plate (19; 43; 47) between the core body and the die (15; 40; 42) having the resin reservoir pots (17; 41; 44), the dummy plate (19; 43; 47) having gate holes (35; 35a; 50) guiding the resin from the resin reservoir pots (17; 41; 44) into the magnet insertion holes (12; 12a), each of the gate holes (35; 35a; 50) overlapping with both of a part of the magnet insertion hole (12; 12a) and a surface of the core body, pouring the resin into the magnet insertion holes (12; 12a) via the gate holes (35; 35a; 50) and curing the poured resin, separating the core body along with the dummy plate (19; 43; 47) from the die (15; 40; 42) having the reservoir pots (17; 41; 44), and removing the dummy plate (19; 43; 47) from the core body by subjecting the dummy plate (19; 43; 47) to a load to remove the resin overflowed from the magnet insertion holes (12; 12a).