WORKING ARM STRUCTURE OF WORKING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a working arm structure of a working machine which can reduce generation of the thermal strain and the thermal deformation in the welding, improve the welding quality, and facilitate the positioning of a bearing member in a fitting structure of the bearing member which is inserted in and joined with a through hole provided in plate members of the working arm formed in a box-shaped section by the plate members. SOLUTION: The bearing member comprises an insertion shaft part to be inserted in the through hole and an abutting part to be abutted on an inner surface of a box-shaped section of plate members.