A reciprocation pump comprising: a supply liquid-side pumping chamber for supplying a liquid from a source to an objective apparatus; a waste liquid-side pumping chamber for discharging a waste liquid discharged from the objective apparatus to the outside; a reciprocation means being able to reciprocate between the supply liquid-side pumping chamber and the waste liquid-side pumping chamber, the reciprocating motion of the reciprocation means performing suction and discharge of the liquid to and from the supply liquid-side pumping chamber as well as suction and discharge of the waste liquid to and from the waste liquid-side pumping chamber; and a driving source for driving the reciprocation means; the reciprocation pump adapted to supply the liquid from the source to the objective apparatus with the supply liquid-side pumping chamber and to discharge the waste liquid from the objective apparatus to the outside with the waste liquid-side pumping chamber and characterized in further comprising: a supply liquid-side sub-pumping chamber (P1a) arranged adjacent to the supply liquid-side pumping chamber at an external side thereof a waste liquid-side sub-pumping chamber (P2a) arranged adjacent to the waste liquid-side pumping chamber at an external side thereof; a rod extending through the supply liquid-side sub-pumping chamber (P1a), the supply liquid-side pumping chamber, the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a) and being connected to the reciprocation means and the driving source to transmit a driving force of the driving source to the reciprocation means; and sealing means (12, 13) arranged respectively in walls through which the rod extends for partitioning the supply liquid-side pumping chamber and the supply liquid-side sub-pumping chamber (P1a) as well as the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a). a supply liquid-side pumping chamber for supplying a liquid from a source to an objective apparatus; a waste liquid-side pumping chamber for discharging a waste liquid discharged from the objective apparatus to the outside; a reciprocation means being able to reciprocate between the supply liquid-side pumping chamber and the waste liquid-side pumping chamber, the reciprocating motion of the reciprocation means performing suction and discharge of the liquid to and from the supply liquid-side pumping chamber as well as suction and discharge of the waste liquid to and from the waste liquid-side pumping chamber; and a driving source for driving the reciprocation means; the reciprocation pump adapted to supply the liquid from the source to the objective apparatus with the supply liquid-side pumping chamber and to discharge the waste liquid from the objective apparatus to the outside with the waste liquid-side pumping chamber and characterized in further comprising: a supply liquid-side sub-pumping chamber (P1a) arranged adjacent to the supply liquid-side pumping chamber at an external side thereof a waste liquid-side sub-pumping chamber (P2a) arranged adjacent to the waste liquid-side pumping chamber at an external side thereof; a rod extending through the supply liquid-side sub-pumping chamber (P1a), the supply liquid-side pumping chamber, the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a) and being connected to the reciprocation means and the driving source to transmit a driving force of the driving source to the reciprocation means; and sealing means (12, 13) arranged respectively in walls through which the rod extends for partitioning the supply liquid-side pumping chamber and the supply liquid-side sub-pumping chamber (P1a) as well as the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a). a supply liquid-side sub-pumping chamber (P1a) arranged adjacent to the supply liquid-side pumping chamber at an external side thereof a waste liquid-side sub-pumping chamber (P2a) arranged adjacent to the waste liquid-side pumping chamber at an external side thereof; a rod extending through the supply liquid-side sub-pumping chamber (P1a), the supply liquid-side pumping chamber, the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a) and being connected to the reciprocation means and the driving source to transmit a driving force of the driving source to the reciprocation means; and sealing means (12, 13) arranged respectively in walls through which the rod extends for partitioning the supply liquid-side pumping chamber and the supply liquid-side sub-pumping chamber (P1a) as well as the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber (P2a).