WORK MACHINE HAVING DRIVER'S CAB

PROBLEM TO BE SOLVED: To significantly improve comfortableness to ride in at work time by effectively cushioning vibration on the floor plate central part side of a driver's cab main body. SOLUTION: Respective cushioning support bodies 13 are respectively arranged between an installing bracket 21C1 of a support beam 21C (a turning frame 21) and a floor plate 24 and between a front frame 21D and the floor plate 24, and four corners of the floor plate 24 are elastically supported on a support part 21A through the respective cushioning support bodies 13. Respective vibration control support bodies 25 are respectively arranged between an installing bracket 21B1 of a support beams 21B and the floor plate 24, and the central part side of the floor plate 24 is elastically supported on the support part 21A through the respective vibration control support bodies 25. A highly rigid beam plate 27 is arranged in the lateral direction in an upper side surface central part of the floor plate 24, and a driver's seat 29 is installed on a pedestal part 27A of the beam plate 27.