To provide a drum brake capable of ensuring the shoe clearance excess adjustment action, and to minimize the drum brake and reduce a weight of the same without impairing the excess adjustment preventing action for shoe clearance.

An adjustment lever 80 comprises an excess adjustment preventing means for shoe clearance 80g to stop the displacement operation in the shoe expanding direction by a back control means 70 when the application force for expanding a brake shoe 20 reaches the predetermined pressing force, and an excess adjustment preventing means for shoe clearance 80d to stop the displacement operation of the shoe expanding direction by the back control means 70 when a temperature in the brake reaches a predetermined high temperature.