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