Cabin and working machine

A cabin mounted on a working machine, comprising:

• a protective frame vertically provided around an operator's seat included in the working machine;
• a roof provided at an upper portion of the protective frame;
• and
• a front window provided at a front portion of the protective frame, wherein
• the front window is vertically divided into an upper window portion, which is coupled to a window frame at the front portion of the protective frame so as to be movable toward a lower surface of the roof, and a lower window portion detachably coupled to the window frame,
• the window frame includes a lower window stay to engage with and support a lower edge of the lower window portion, and a lock receiver to hold a side edge of the lower window portion in a closed position, and
• the lower window portion includes at least one lock to be fitted to the lock receiver when the side edge of the lower window portion is overlapped with the window frame.