| 摘要 |
PROBLEM TO BE SOLVED: To prevent development of cracks or cracking around an opening part for a door in a cab box by increasing rigidity around the opening part for a door. SOLUTION: An opening part 13 for a door is provided in a side surface part 8D of a cab box 8, a hollow front pillar part 14 is formed at a front side position of the opening part 13 for a door, and a hollow center pillar part 15 is formed at a rear side position of the opening part 13 for a door. At an upper side position of the opening part 13 for a door, an upper pillar part 17 is formed, and at a lower side position, a hollow lower pillar part 18 is formed of a reinforcement plate 34, etc. The front pillar part 14, center pillar part 15, upper pillar part 17, and lower pillar part 18 are communicated with each other to form a closed loop of reinforced frame space 19 which completely surrounds the opening part 13 for a door from the front side, rear side, upper side, and lower side.
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