To facilitate head light mounting with simple structure for the head light mounting structure equipped with an aiming mechanism for especially adjusting an optical axis of the head light in scooter type motorcycle or the like.

A head light bracket 41 is disposed inside of the head light 16 along an upper half side of a head light opening part 40, and screwed on bosses 42, 42, 44, 44. Aiming shafts 43, 43 projectingly formed on the both right and left side parts of the head light 16 are rotatably supported on the side parts 67 provided on the right and left of the head light bracket 41. An aiming stay 53 is provided on a lower end part of the head light 16, and a bracket 57 supporting a head part 56 of an aiming screw 55 adjusting a slide nut 54 engaging therewith.