To provide a screw capable of generating a rotating magnetic field and a generator capable of being compactly attached to a water pipe or the like by using a screw.

Blades 12, 14 magnetized in N poles and blades 13, 15 magnetized in S poles are alternately provided on the screw 10. The screw 10 is formed of a ferrite magnet and a rare earth magnet. The generator 20 includes a pipe 21 having the screw 10 rotatably fixed therein, a coil 23c provided around the screw 10 of the pipe 21, and at least two terminals 25 taking voltages out of the coil 23c, and generates voltages between the terminals by making a fluid flow in the pipe 21.

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