The body part of the medical connector is constructed in such a way, that is,Valve components are arranged in the shell for receiving and being formed in recess portion. Link male to male connector, linkage section makes valve components and signed body part in the head with promotion. Therefore, fluid looks like the reception groove formed on the outside for passing through fluid communication channel with the medical instrument linkage section in fluid channel in positive connector, covers with body part, and is receiving recess.