To provide a rear suspension device of an automobile capable of obtaining an optimum damper lever ratio without deteriorating a damper efficiency in respective settings of a front wheel drive vehicle, a four-wheel drive vehicle, or a rear wheel drive vehicle.

This rear suspension device 1 of an automobile comprises suspension links 10, 12, 14, 16; a wheel supporting member 18; a damper 30 extending upward and downward of the vehicle body and mounted to the wheel supporting member on a bottom end 30b; a first damper mounting part 40 installed to the wheel supporting member and connected to the damper bottom end in such a manner that the damper extends substantially through a rotary center axis position of the rear wheel; and a second damper mounting part 42 installed to the wheel supporting member and connected to the damper bottom end in such a manner that the damper extends through a front side or a rear side in the fore-and-aft direction of the vehicle body offset from the rotary center axis position of the rear wheel. The bottom end of the damper is mounted to either one of the first and second mounting parts.