PURPOSE: To provide a cab in which an operator can get without bending one's waist or from which he can get out and also of which door can be smoothly opened/closed.

CONSTITUTION: This cab is provided with the cab body 37 of which front part and the upper part near the front are continuously opened and a hook-shaped door 38 with the same size with the opening 39 made of the front wall 32 and the front ceiling wall 35. This door 38 is fitted to the cab body 37 so as to freely and linearly slide breadthwise and open/close the opening 39.