Stump grinder comprising a chassis (10) having a front side (11) a grinder arm (30) which is provided on an outer end (31) with a grinder (20) and which is connected on another outer end (32) to the chassis (10) by means of a rotating head (40) wherein the rotating head (40) is provided on a front side (11) of the chassis (10) and the rotating head (40) comprises a first rotating cylinder (41) and a second rotating cylinder (42), wherein the first rotating cylinder (41) is mounted for moving the grinder arm (30) up and downward round a horizontal axis (A1) and the second rotating cylinder (42) is mounted for pivoting the grinder arm (30) round a vertical or inclining axis (A2).
