An inflatable pad includes: an inflatable pad body having a looped surrounding layer interconnecting top and bottom layers to cooperatively define an inflatable space; and a reinforcing belt unit disposed in the inflatable space in the inflatable pad body and connected between the top and bottom layers of the inflatable pad body. The reinforcing belt unit includes two coupling belts and a main reinforcing belt. Each coupling belt is attached fixedly and partially to a corresponding one of the top and bottom layers of the inflatable pad body, and has a central portion that is spaced apart from the corresponding one of the top and bottom layers of the inflatable pad body and that is connected to a corresponding one of opposite looped end portions of the main reinforcing belt.