A medical preparation dividing method is dividing a medical preparation stored in a storage member into a plurality of division bags by gravitational force through a primary tube, a branch portion, and a plurality of branch tubes. A medical preparation dividing unit has a curved portion formed in another end side of the primary tube, an inlet of the branch portion arranged above the curved portion, and outlets of the branch portion arranged above the inlet, in a state where the plurality of division bags is held with a holding tool.
