PROBLEM TO BE SOLVED: To provide a working machine capable of improving durability and vibration control performance.SOLUTION: A chain saw includes a casing 5 for storing an engine to drive a saw chain and including a recessed portion 15, a frame 9 including a handle gripped by a worker and a projection 14 having an outer diameter smaller than an inner diameter of the recessed portion 15, an outer wall 23, a hole 21 including an inner wall 22 substantially concentric with the outer wall 23 extending from an opening 33 located at one end toward the other end and a groove 28 extending from the other end toward one end between the outer wall 23 and the hole 21. Furthermore, the chain saw includes an elastic member 20 for connecting the casing 5 and the frame 9 by inserting the outer wall 23 into the recessed portion 15 and inserting the projection 14 into the hole 21.
