To reduce abnormal noise production in a friction brake structure, the friction brake structure includes: a brake plate (20) fixed to a rotating shaft (15) of a rotary electric machine (1); a ring-shaped brake shoe (30) disposed facing the brake plate; and a brake shoe support plate (40) which engages with a fixing portion of the rotary electric machine so as to be movable in an axial direction, and which supports the brake shoe and is biased by biasing action so as to bring the brake shoe into sliding contact with the brake plate.