To shorten unapplied and applied times for a brake, reduce a shock and noise, and lighten weight.

Two sets of D.C. electromagnets constituted of a movable iron core 3, a fixed iron core 7 for incorporating an electromagnetic coil, guide and torque pins 4 and 5, a brake coil spring 8, and a lining 2 are fitted to a fixed frame 11 and the core 3 respectively, to nippedly press the both the surfaces of a disc.