The present invention relates to an eccentricity prevention device for a pumping device, which reduces an eccentric movement of an internal component due to an external force while reducing a free movement of a pumping lever, the eccentricity prevention device including a lever bracket coupled to the pumping lever, a housing having a clutch device provided therein and coupled to a position facing the lever bracket by the clutch device, and an elastic member elastically supported on the lever bracket while providing an elastic restoring force in a direction in which an eccentric movement of the clutch device being bent with respect to a rotation axis is canceled.