Provided is a novel needle-less connector configured so that the back flow of blood or the like can be prevented by a simple structure.A needle-less connector (10) has an elastic valve body (14) provided at the front end opening (41) of a medical liquid passage (28) formed in a housing (18). The insertion of a male luer (92) into a slit (62), which is formed in the elastic valve body (14) so as to penetrate therethrough, opens the elastic valve body (14) and connects the male luer (92) to the medical liquid passage (28). The front end opening (41)-side end surface of the medical liquid passage (28) in the housing (18) is set as a protruding support surface (32), the center portion of which protrudes and which slopes toward the foot. The elastic valve body (14) is superposed on the protruding support body (32) so as to be in close contact therewith. The insertion of the male luer (92) into the slit (62) in the elastic valve body (14) causes the expansion and deformation of the elastic valve body (14) along the protruding support surface (32). Also, a flexion section (42) is formed on the sloped surface of the protruding support surface (32). The sloped surface has different tilt angles on the foot portion (34) side relative to the flexion section (42) and on the crest portion (36) side relative to the flexion section (42).Linvention concerne un nouveau raccord sans aiguille configuré de telle sorte que le reflux de sang ou similaire peut être empêché par une structure simple. Un raccord sans aiguille (10) a un corps de valve élastique (14) disposé à louverture dextrémité avant (41) dun passage de liquide médical (28) formé dans un boîtier (18). Lintroduction dun luer mâle (92) dans une fente (62), qui est formée dans le corps de valve élastique (14) de façon à pénétrer à travers lui, ouvre le corps de valve élastique (14) et relie le luer mâle (92) au passage de liquide médical (28). La surface dextrémité côté ouverture dextrémité avant (41) du passage de liquide méd
