Abstract: A working machine includes: a counterweight having a weight outer surface having such a shape as to cover at least a part of left and right portions of the machine chamber and cover a rear portion thereof, a weight inner surface, and a weight top surface; and an antenna support member having an antenna attachment part and a plurality of legs. The counterweight has a weight recess part recessed from the weight outer surface toward the weight inner surface at an upper end of the weight outer surface. The legs include a first leg having a first fixed part fixed to the weight recess part, and a second leg having a second fixed part fixed to the weight recess part or the weight top surface.