A foldable cart includes a frame mechanism, a wheeled rear support mechanism and two spaced-apart handle units. The frame mechanism can be in a collapsed state or an expanded state. The wheeled rear support mechanism is mounted pivotally to a rear side of a main frame body of the frame mechanism and movable between a supporting position and a fully folded position with respect to the main frame body. The handle units are rotatably connected to the main frame body to drive the frame mechanism to be in the collapsed state or the expanded state.