To provide a parking brake capable of simplifying machine work and capable of reducing a cost.

This parking brake of a planetary gear type transmission has plural brake actuating springs 16 being arranged between an output housing 8 and a brake piston 14 on the output shaft 2 side of the planetary gear type transmission and imparting sandwiching force to a parking brake friction plate 4 and a mating plate 12. An annular groove 20 is arranged on an inside surface of the output housing 8, and a plate-like spring receiving member 30 is placed on one end of the springs 16 to be arranged in the annular groove 20.