An analysing device for reaped and harvested plants in a heap or swath (C), comprising: a containment shell (2), provided with a tapered conformation from a rear portion (22) towards a front portion (21) that faces an advancement direction (A) with respect to a swath (C)； an analysis window (4), fashioned through a wall of the shell (2)； one or more analysing sensors (5), placed inside the shell (2) in a position such as to face towards the analysis window (4), for sensing the environment outside the shell (2) through the window (4) itself.
