PURPOSE: To easily and quickly adapt a conveying pump to the height of a reservoir by providing an ascending line formed of plural position adjustable members which can be locked at different heights to vary the length of the ascending line for supplying a conveyed medium to a discharge line.

CONSTITUTION: This conveying pump 11 is provided with a cylinder 12 which has a suction valve 18 and a discharge valve 19 and is introducible into a reservoir. In the cylinder 12, a pump piston 14 is disposed. A conveyed medium is supplied to a discharge line 20 through an ascending line 21 connected to a valve case 17 of the discharge valve 19. In this case, to vary the length of the ascending line 21, the ascending line 21 is formed of plural position adjustable members 22, 23 which can be locked at different heights. To lock the respective connecting members 22, 23 on the valve case 17 or the discharge line 20, an elastically deformable adjust lever 25 is provided extending toward the ascending line 21, and is engaged with a projection 26 formed on each connecting member 22, 23 and plural cutouts 28, 28'.