To prevent contamination of a stored awning at the time of loading loads.

Lateral grooves 36 in which frame bodies 44 and an awning 45 are inerted is formed in both side walls of a protector 35 on the back of a cabin 20, or tip side parts of guide rails 41 are disposed on the inner side of the protector 35, and all or most part of the frame bodies 44 and the awning 45 are stored between both side walls of the protector 35. On the protector 35, a cover body 38 to cover the frame bodies 44 and the awning 45 stored is provided.