Cabin system

The present invention relates to a cabin system to be mounted on a vehicle body (2). This cabin system comprises a driver's seat (34), a plurality of support pillars (17, 18) including a pair of right/left front support pillars (17) and constituting a cabin framework (16), and a ceiling portion (26). A front upper beam (19) joining the upper portions of the pair of right/left front support pillars (17) is formed and arranged such that a bottom face (19a) of said front upper beam (19) extends substantially parallel with the line of sight (S) of a driver (A) seated at a driver's seat (34) within said cabin framework (16).