Unit with longitudinal beam and front plate for a motor-vehicle front structure, comprising a longitudinal beam in the form of a hollow profile and a front plate rigidly connected to a front end of said longitudinal beam. The longitudinal beam comprises a first beam element defining an upper wall, a lower wall and a first side wall of the longitudinal beam and a second beam element having a wall defining a second side wall of the longitudinal beam. The front plate has a rear face facing towards the longitudinal beam to which there are welded a first flange and a second flange which are separate from each other, for connecting the front end of the longitudinal beam. The first flange is a C-shaped bracket with an upper wall, a lower wall and a side wall respectively welded to the upper wall, the lower wall and the first side wall defined by said first beam element. The second flange is an L-shaped bracket, with a first wall welded to the rear face of the front plate and a second wall facing towards said second side wall defined by said second beam element. The above mentioned welds are electric spot welds. The two flanges may have different thickness.