| 摘要 |
PROBLEM TO BE SOLVED: To improve workability by releasing a door opening time lock device still in its position by an operator coming out of the inside of the cab and moving to the rear of a cab. SOLUTION: A rotary door 5 is arranged in a cab main body 4a for forming an operation room so as to be freely openable/closable, and an opening time lock device 7 is arranged to fix this door 5 to the cab main body 4a in a door opening state. Then, this opening time lock device 7 is provided with a first lock release mechanism 21 for unlocking the opening time lock device 7 from the inside of the operation room and a second lock release mechanism 22 for unlocking the opening time lock device 7 from an opposite side cab main body outside, that is, the rear of the cab main body 4a through the door 5 in an opening state to this first lock release mechanism 21.
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