A brake apparatus (100) includes a first coupling member (35) coupled to one end part (31) of one of a pair of link arms (30), a second coupling member (36) coupled to the one end part (31) of the other of the pair of link arms (30) to freely advance and retract with respect to the first coupling member (35), an actuator (20) configured to advance and retract an output member (21), a lever (40) rotatably coupled to the output member (21) and configured to be rotated by advancing and retracting movements of the output member (21) and a booster unit (50) configured to advance and retract the second coupling member (36) with respect to the first coupling member (35) by boosting a force transmitted by the rotation of the lever (40).