A walk-behind work machine (10) having a foldable operating handle (16) is disclosed. The operating handle (16) is swingable and foldable about a first linking pin (41) with respect to a handle-attachment part (17) of a work-machine body (11) from a usage position to a storage position, and adapted to be locked in a usage position by a second linking pin (51). The second linking pin is present on one of the operating handle and the handle-attachment part, and the distal end part (53) of the second linking pin is formed in a tapered shape. The other of the operating handle and the handle-attachment part has a second pin-fitting hole (33) allowing insertion and retraction of the distal end part. When the distal end part is fit into the second pin-fitting hole, no gap is present in the second pin-fitting hole due to the tapered surface (57) of the distal end part, and the operating handle is locked in the usage position.
