PURPOSE: To eliminate intermittent machining and to secure an electromagnetic brake firmly to a bracket by pressing a brake board.

CONSTITUTION: A brake board 45 comprises upper and lower press boards 45m, 45h. The lower press board 45h has a first bottom section 45j provided with a through-hole at one end of a first cylindrical section 45i, and an engaging chip 45k is provided. The upper press board 45m is provided with six click sections 45q having through-holes at one end of a second cylindrical section 45n, and it is further provided with six second click sections 45s at the outer circumferential section of the second circumferential section 45r thereof. When the click sections 45q are fitted in the through-holes of the first cylindrical section 45l, the upper and lower press boards 45h, 45m are integrated.