To provide a mounting structure of a towing hook capable of improving the mounting strength of the towing hook, determining a position of a towing point sufficiently at a lower part, easily positioning and temporarily holding (temporarily fastening) the towing hook in assembling the towing hook, and fixing a bumper to a car body side without adding a new component.

A hook bracket 2a is mounted on a car body bracket 13 fixed to a car body side by means of a first fastening means (for example, bolts 23a, 23b and nuts 24a, 24b) for fastening in the vertical direction of a car body and a second fastening means (for example, a bolt 23c and a nut 24c) for fastening in the longitudinal direction of the car body thereby to mount the towing hook 2 to the car body through the car body bracket 13.