To provide a technology capable of avoiding the leakage of fluid fuel from a canister by improving the protecting performance of the canister.

In the mounting structure of the canister 40, a vehicle body frame 20 includes right and left rear side frames 21, 21 extending in a fore-and-aft direction, a cross member 22 or 23 laid between the rear side frames 21, 21, and a floor panel 60 provided on the rear side frames and the cross member. The canister 40 is disposed so as to be stored between the right and left side frames 21, 21 between a front end 54 and a rear end 55 of a sub frame 50 mounted at a rear portion of the vehicle body frame 20 so as to support a rear suspension. The sub frame 50 unites so as to connect the right and left rear side frames 21, 21 and the cross member 22 or 23. The protecting performance of the canister is further improved, and the leakage of the fluid fuel from the canister is certainly avoided.