Head for hedge trimmer comprising an external casing (2, 102) having an axis of rotation (X) and equipped with at least one lateral exit hole (4, 104) for a cutting wire (F), the external casing (2, 102) internally having a seating for the storage of a part of the cutting wire (F) so that an end portion (E) of the wire (F) exits from the casing (2, 102) through a lateral hole (4, 104). The head (1, 101) comprises, within the seating, a pair of presser discs (5, 6, 105, 106) facing each other and defining between them an annular shaped housing (7, 107) to contain said part of the cutting wire (F), the presser elements (5, 6, 106, 106) being movable towards each other along said axis of rotation (X) for compressing between them the part of the cutting wire (F) stored between them.
