A brake mechanism (50) of a fishing reel (1) is provided, which includes a washer set (60), an operation member (70), a tubular member (80) and a brake adjusting device (90). The fishing reel (1) includes a shaft (20). The washer set (60) includes a first driving washer (61) and a first brake washer (63) sleeved to the shaft (20). The operation member (70) is coupled with the first driving washer (61), rotatable together, extended through the washer set (60), located between the shaft (20) and washer set (60), and abutted against the washer set (60). The tubular member (80) is axially movably disposed at the shaft (20) and abutted against the operation member (70). The brake adjusting device (90) is sleeved to the shaft (20) and abutted against the tubular member (80) and includes a control member (91) screwingly engaged to a thread section (27) of the shaft (20). Accordingly, the shaft (20) would not be damaged by the washer set (60), and a brake status being released smoothly can be ensured.
