Provided is a connector (1) that can easily be tuned for a pulsation frequency that is to be reduced and with which a decrease in sealing performance can be prevented when a piston (70) moves. A pulsation reduction member (50) employs a construction whereby a piston (70) moves within a cylinder (60). The cylinder (60) has an annular flange part (62) that juts inward in the radial direction of the cylinder. An elastic seal member (80) is held in a compressed state between the end face of the flange part (62) of the cylinder (60) and the end face of the piston (70). A biasing body (90) is arranged in the cylinder (60) in the region on the opposite side of the piston (70) from a flow path (12) and imparts biasing force which moves the piston (70) toward the flow path (12) and compresses the elastic seal member (80).
