An object is to provide a magnetic field generator permitting fabrication by a simple manufacturing technique, such as plating, and capable of suppressing the generation of an eddy current as well as a photomagnetic information storage apparatus capable of high speed data recording and reproduction. It has an annular coil 311 surrounding an inner hole, and a plurality of magnetic rods 312 radially disposed centering on the inner hole of the coil 311 so as to overlap the coil 311, insulated from the coil 311 and consisting of a magnetic material, the maximum width of each rod being not more than twice the minimum width.