A head for an edge trimmer, comprising a casing (1), destined for comprising at least a cutting wire reel and to be set in rotation about an axis of rotation (X), said casing comprising at least one outlet opening (11), which is so structured as to enable passage of a portion of the cutting wire. The head comprises two bushes (12) which laterally delimit the outlet opening (11) and are rotatable about a respective axis of rotation (Y).