To effectively prevent vibration from being transmitted from a frame-side to a cab-side by increasing resonance frequency of a mount bracket with a cab fastened to a frame.

A cab mount structure 10 is provided in a frame 14 of a vehicle, and includes: a frame-side mount bracket 18 containing a receiving part 22 formed in a bowl shape opened upward, an annular elastic member 20 stuck to an inner peripheral surface of the receiving part 22 of a frame-side mount bracket 18, a cab-side mount bracket 19 provided in a vehicular cab 11 and including an engagement part 26 formed in a bowl shape opened upward, and a fastening mechanism 21 for fastening the frame-side mount bracket 18 to the cab-side mount bracket 19 with the engagement part 26 of the cab-side mount bracket 19 engaged with the receiving part 22 of the frame-side mount bracket 18.