| 摘要 |
PROBLEM TO BE SOLVED: To improve the yield strength of a door and efficiently transmit the impact load at a side impact to a vehicle body side by improving the initial resistance of a door beam without complicating a structure. SOLUTION: The tip section 2c of a main sash 2b is fixed to the vehicle body inside of the front end section 27a of the door beam 27 arranged in a front door main body 2a, and the shaft end of a steering support beam 25 is fixed to its inside to cross it on the vehicle body side view. The initial resistance of the door beam 27 is improved, the crush stroke of a front door 2 unit is shrunk, the impact load transmitted to a font pillar 11 from the front door 2 can be accepted by the steering support beam 25, thereby the impact load at the side impact can be efficiently transmitted to the vehicle body side via the front pillar 11.
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