the invention relates to a bit holder for an earth working machine , in particular a road milling machine , that comprises a bit receptacle in the region of a working side of a support member and that indirectly or directly carries an insertion projection on an insertion projection side of the support member , the support member comprising two stripping surfaces that form a stripping surface pair and are at an angle to one another . in order to achieve a stable and long - lived configuration with such a bit holder , provision is made according to the present invention that the support member comprises at least one further stripping surface that is at an angle to the two stripping surfaces of the stripping surface pair .