Magnetic structure has been revealed in very large region of our Galaxy, including that in the Galactic disk, Galactic halo and the Galactic center. The main data are the rotation measures of pulsars and extragalactic radio sources, together with direct polarization maps of the Galactic plane at cm wavelength and clouds at mm, submm or infrared. Here I review the known magnetic structure of our Galaxy, and show where we have to measure in the future.