To obtain a high efficiency at all the operating points of a propeller, by making the pitch distribution of the propeller almost constant, in all the operating points, that is, in either case of a high speed go-ahead time, a low speed go-ahead time, a stopping time, a go-astern time, and the like, in a controllable pitch propeller for vessel.

The shaft 2 of an auxiliary propeller blade 3 which is smaller than a main propeller blade 1 is penetrated in the shaft of the main propeller blade 1, the rear edge of the main propeller blade 1 and the front edge of the auxiliary propeller blade 3 are positioned on the extension of the center of the shaft 4 of the auxiliary propeller blade 3, and the pitch of the auxiliary propeller blade 3 is interlocked to the variation of the pitch of the main propeller blade 1, and also made possible to vary larger than the variation of the pitch of the main propeller blade 1.