Patent ID: 7712818

Claim:
A box-shaped cab for a work machine, in which an operator operates the work machine, having a front surface portion, a rear surface portion, left and right side surface portions, a floor surface portion, and a ceiling surface portion, the cab comprising: a frame body having a pair of rear side structural members and a pair of lateral side structural members, the rear side structural members being respectively erected from both ends of the floor surface portion on a rear surface side to support the rear surface portion, the lateral side structural members being respectively erected from both ends of the floor surface portion on a front surface side, bent along the front surface portion and the ceiling surface portion, and connected to upper ends of the rear side structural members; a pair of rail members respectively fixed to the pair of lateral side structural members such that grooves of the rail members are opposed to each other, the pair of rail members each having a vertical portion along the front surface portion and a horizontal portion along the ceiling surface portion; and a rectangular window frame slidably mounted to the grooves of the pair of the rail members, the window frame being stored in the front surface portion or the ceiling surface portion, wherein the vertical portions of the rail members are directly fixed to the lateral side structural members, and the horizontal portions of the rail members are fixed to the lateral side structural members via intermediate members, wherein the intermediate members each include a stepped portion arranged substantially at a central position in a width direction thereof, and an upper side of the stepped portion of each of the intermediate members is fixed to a respective one of the lateral side structural members such that a lower side of the stepped portion is in a cantilevered state relative to the respective lateral side structural member, and the lower side of the stepped portion is fixed to a respective one of the rail members.