Abstract: A polarized electromagnet with improved response sensitivity includes an axially movable core 63 extending through an excitation coil 61 to be movable between two positions upon energization and deenergization of the coil 61. The core 63 is formed at its opposite ends respectively with pole plates 69 extending transversely of the core axis. Inner and outer yokes 64 and 65 are arranged in parallel to the core 63 and are magnetized to the opposite polarities by a permanent magnet 65. Inner and outer yokes 64 and 65 have at respective ends inner and outer pole ends 67 and 68 which are spaced axially to each other so as to form therebetween magnetic gaps in each of which the adjacent one of the pole plates 69 is located.