To provide a polyester film of high quality having excellent winding properties, cutting resistance and scratch resistance to be applied to acceleration of a manufacturing line of the film and a tape and to simultaneously provide a video-soft tape having excellent durability with small decrease in image quality at the time of fast dubbing.

This video-soft tape comprises a biaxially oriented polyester film for a magnetic recording medium which has 20,000 pieces/mm2 or more of maximum number of protrusions (PC-H) of at least one surface of the film measured by a non-contact threedimensional surface roughness meter and 4 to 10 of maximum protrusion number ratio [α: (PC-H)/(PC-S)] of the maximum number (PC-H) measured by the meter to maximum number of protrusions (PC-S) measured by a contact three-dimensional surface roughness meter, and a biaxially oriented polyester film layer, a magnetic layer.