To provide a connector for fluid and a mounting structure of fluid parts, simply forming a fluid circuit by connecting two or more fluid parts manufactured individually.

This connector for fluid includes: a first frame 7 formed on a body 5 mounted in a through hole 18 where a capillary 17 formed in the interior of a base plate 16 is exposed from the wall surface thereof; a first opening 2 disposed opposite to the capillary 17 in the first frame 7; a second frame formed in the body 5 extending toward the outside of the base plate; a second opening disposed in the second frame; and an adaptor 6 mounted on the second frame, one end of which is connected to an external fluid part 20, and is characterised in that a passage is demarcated by the first frame and the second frame between the first opening 2 and the second opening.