Shoulder support for a motor includes: a back-plate which is adapted for being associated with the back of an operator through shoulder straps and includes a shaped body to contact with the back of the operator to which a frame is fixed, the frame being substantially L-shaped and includes a first portion, fixed to the back-plate, and a second portion undercut with respect to the first portion and comprising a through opening with substantially vertical through axis, the motor being connected at the top the of second portion; a connection body adapted for being rigidly connected to the motor; and a resilient support element adapted for connecting the connection body to the frame in a floating manner inside a seat defined by the through opening. The resilient support element includes a plurality of springs, having axes, which lay on a plane adapted for being arranged transversally to a vertical direction.