To provide a propeller high in convenience and functionality in forming process, strength, miniaturization and folding-up of the propeller.

This propeller has a thin flexible and elastic material formed as a propeller blade of minimum one sheet or a blade member of a structure having rigidity but bendable by a means such as a hinge in the blade for forming the propeller and a propeller hub of minimum two sheets, and is constituted so as to change the distance of the propeller hub, a rotation angle phase and also a rotation angle phase by rotating the blade installed in the propeller hub on its both blade ends.