PURPOSE: To facilitate the drawing and locking of a roll type curtain as well as to reduce the number of constituent parts items of a cab by forming a curtain guide, covering a glass eindow, integrally together with a cam member.

CONSTITUTION: A guide 2 fitted with three hooks 3 is installed in a cab member 1, and in order to prevent a glare out of roof glass, and operator draws a rod 6 of a roll type curtain 4 overhead with his hand, hitching it on these hooks 3 for locking. Likewise in order to reinforce the cab member 1 by means of a notch of the guide 2, a reinforced member 5 is added to the cab member 1. Since a drawing and locking method of the roll type curtain 4 like this is excellent in operability, the operator can be concentrated on crane operations without being distracted to what the rod 6 of this roll type curtain 4 is locked. In addition, as the guide 2 with hooks is integrally formed in the cab member 1, machining for a complex bracket becomes useless and, what is more, the number of parts item constituting the cab will get off with smallness.