The recent progress in the portable synchrotron MIRRORCLE‐20 for brilliant FIR or IR source for the life Science research is reported. The new MIRRORCLE‐20 FIR beam line is consist of the special optics which collect all radiation, emitted from the exactly circular 156mm radius electron orbit, by using both circular mirror and quasi‐ellipsoidal mirror (magic mirror). The optics designed is somewhat different from the conventional SR beam line optics. In case the whole radiation is collected and the e‐beam lifetime reaches 1 minute, 10W power in total are available. The beam line was tuned to maximize the light extraction. © 2004 American Institute of Physics