| abstract |
[PROBLEMS] To provide a support for a magnetic recording medium excellent in dimensional stability, electromagnetic conversion characteristics, crack durability at high temperature, running durability, and storage stability, particularly when the magnetic recording medium is used. The present invention provides a support that can be used as a magnetic recording medium that is small in dimensional change due to environmental changes and has a small change in electromagnetic conversion characteristics after being stored in a cartridge, and a magnetic recording medium comprising the same. The biaxially oriented polyester film has layers (M layers) containing a metal oxide on both sides, the surface resistivity of both surfaces is 1 × 10 4 to 1 × 10 13 Ω, and The sum of the Young's modulus in the direction and the width direction is 10 to 22 GPa, and the ratio Em / Et of the Young's modulus Em in the longitudinal direction to the Young's modulus Et in the width direction is 0.5 to 1.0. A support for a magnetic recording medium having a bending stress in the longitudinal direction of 50 to 150 μN obtained in (1) above. [Selection] Figure 1 |