Aconnector (10) includes: a housing (22) which has, inside thereof, a main line flow path (38) which allows an infusion fluid flowing from a first tube (20a) to flow therethrough into a second tube (20b) ； a connection terminal (32) which is provided so as to be continuous with the housing (22) and can connect thereto a third tube (20c) ； a connection side space (52) which is continuous with the main line flow path (38) and surrounded by an inner wall (53) of the connection terminal (32)； and a rib (56) which is provided so as to extend obliquely with respect to the axial direction of the main line flow path (38) in plan view and guides the infusion fluid so as to generate a turbulence flow inside the connection side space (52).
