A foldable rollator includes: a main support frame including two spaced-apart front support rods a rear support frame including two spaced-apart rear support rods pivotally coupled to the front support rods, respectively a plurality of wheels respectively installed on the main support frame and the rear support rods for rolling on the ground an intermediate support frame coupled to the main support frame and the rear support frame, including a front support sub-frame pivotally coupled between the front support rods and a rear support sub-frame pivotally coupled between the rear support rods, the front and rear support sub-frames being further pivotally coupled to an axle a seat unit disposed atop the intermediate support frame and a backrest unit pivotally coupled to the axle.