Provided is a connector (1) which can facilitate tuning of frequency of pulsation to be reduced and prevent sealing performance from degrading when a piston (70) moves. A pulsation reducing member (50) adopts a structure in which the piston (70) moves in a cylinder (60). The cylinder (60) has an annular flange portion (62) projecting in a radially inner direction of a hollow cylindrical shape. An elastic sealing member (80) is sandwiched in a compressed state between an end surface of the flange portion (62) of the cylinder (60) and an end surface of the piston (70). An urging body (90) is disposed in a region in the cylinder (60) on a side of the piston (70) opposite to a passage (12) and applies urging force to move the piston (70) toward the passage (12) and compress the elastic sealing member (80).
