PURPOSE: A cab support structure is provided to obtain a protecting function for protecting a cab or a worker from great impact force acting on the cab through simplified constitution. CONSTITUTION: A cab support structure supports a cab(2) on a vehicle body frame(1) through a damping mechanism(25). A restricting member(26), restricting displacement just when predetermined displacement occurs to the cab for the extension direction of the damping mechanism, is installed to the cab support structure separately from the damping mechanism. The restricting member has a cabs-side member attached to the cab side. The cab-side member is arranged in a state of having incoherent relation with the vehicle body frame side. The restricting member restricts the displacement of the cab before stroke end of the damping member.
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