Abstract: An erasing head for magnetic recording medium by magnetizing said recording medium with a permanent magnet is improved by a ferrite head body having a slider plane wider than a track to be erased, and, a magnetic metal thin film covering said slider plane. Said magnetic thin film solves the problem caused by undesired natural magnetization of a permanent magnet, so as to improve the erase ratio and S/N ratio, and the use of slider plane wider than that of a track simplifies producing process of the head since no step is provided between the track to be erased and neighboring track, and no polishing process for smoothing said step is required.