To obtain a recording medium coping with high speed processing of good CSS characteristic adding continuous intensity modulation to a laser beam with an intensity modulation signal, setting a ratio between the max-value and the min.value (max.value/min.value) of laser output intensity to a specified value and forming a texture arrayed with protrusions on a substrate of a magnetic recording medium.

A laser beam from a continuous oscillation laser is added with external modulation by a modulator 12 and subjected to output adjustment by an attenuator 13. The laser beam is transmitted to a beam converging lens 15 by a laser beam transmission means 14, is condensed to a prescribed size and irradiates a magnetic recording medium substrate 17 rotated by a spindle motor 16. A max.value/min.value of laser beam output intensity is set to a prescribed value in a range of 1-2. Preferably, the condensing spot diameter of a laser beam on the substrate is set to 1-20 μm, the texture, in which protrusions are helically arrayed, are formed by moving the substrate or the laser beam in parallel, a number of revolutions of the substrate is set to 10-20000.