To provide a pulsation removing device for a fixed displacement pump by removing pulsation of the fixed displacement pump to stabilize a supply condition in a feeding destination.

The pulsation removing device 20 is provided in the middle of a discharge side pipe of a mortar supplying pump 3 comprised of a tube pump, a supply pipe 22 is provided on a receiving container 21 of an inverted truncated cone shape to be slidable in a direction of its generating line, and the mortar fed from the supply pipe 22 is supplied to the receiving container 21. A supply opening of the supply pipe 22 is directed in a tangential direction so that the mortar reaches a discharge opening 20a in a gyratory motion and pulsation is attenuated and eliminated by resistance during flowing. The discharge opening 20a is connected to a mortar supply pipe 10 which is in communication with a drum 11 of the feeding destination and the mortar is supplied to the drum 11. The pipes and so forth can be easily cleaned by water washing when operation of the pump 3 is stopped.

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