Patent ID: 7413241

Claim:
A cab of a working machine, comprising: a plurality of support pillars erected around an operator's seat of the working machine, said cab enclosing said operator's seat to protect the seat, wherein the entire length of at least one of said support pillars is configured by a combined support pillar formed by combining a plurality of plate members extending in a longitudinal direction of the support pillar concerned to define a closed section, and in said closed section, an end face in a transverse direction of one of adjacent plate members of the plate members is abutted against an inner surface of the other plate member and in this state the abutted portion of the plate members is fillet-welded substantially throughout the overall length of each of the plate members, wherein said combined support pillar includes a support pillar erected behind said operator's seat, wherein said plate members include a pair of opposed plate members disposed so that respective inner surfaces confront each other and a pair of interposing plate members interposed between the inner surfaces of said opposed plate members, and a closed section of a quadrangular shape is formed by said opposed plate members and said interposing plate members, and wherein said opposed plate members are disposed in such a manner that the respective inner surfaces confront each other in the longitudinal direction of the working machine.