| 摘要 |
PROBLEM TO BE SOLVED: To provide a high density magnetic recording medium capable of recording for a long time and small in the fluctuation of reproducing output. SOLUTION: In the magnetic recording medium 1 having a magnetic layer 3 formed on one surface of a non-magnetic supporting body 2, the non-magnetic supporting body 2 is composed of a polyethylenenaphthalate film and has >=4.0μm to <=10.0μm, 950kg/mm<2> young' modulus in the width direction, <=6% coefficient of thermal contraction at 150 deg.C in the width direction and >=2.0nm to <=6.0nm surface roughness SRa of the surface of the side on which the magnetic layer 3 is to be formed.
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