A magnetic component has a primary coil 10; a secondary coil 20 disposed to face the primary coil 10; a core 500 which passes through the primary coil 10 and the secondary coil 20; and a coil sealing part 50 which seals at least the primary coil 10 and the secondary coil 20, and a part or whole of region between the primary coil 10 and the secondary coil 20 and the core 500.