Boat propeller capable of being easily changed in pitch thereof

A boat propeller comprising:

• a hub formed of a front cylindrical member and a rear cylindrical member which are detachably joined together, said front cylindrical member provided in a rear edge of an outer periphery with a plurality of front side insertion slots arranged equiangularly and circularly, said rear cylindrical member provided in a front edge of an outer periphery with a plurality of rear side insertion slots corresponding to said front side insertion slots, said rear side insertion slot and said front side insertion slot forming a receiving cavity with a wide interior and a narrow opening, said receiving cavity provided in a bottom with a first retaining portion;
• a plurality of angle setting members equal in number to said cavities, said angle setting members being detachably disposed in said cavities and provided with a second retaining portion which is retained by said first retaining portion such that said angle setting members are retained at a predetermined angle in relation to said hub, each of said angle setting members having a first connection portion facing outwards;
• and
• a plurality of blades equal in number to said cavities and having a blade piece portion and an insertion portion connected with an inner end of said blade piece portion, said blades being circularly disposed in the outer periphery of said hub such that said insertion portions are inserted into said cavities, said insertion portions being provided in an end surface with a second connection portion which is joined with said first connection portion of said angle setting members to enable said blade and said angle setting member to retain at a predetermined angle.