Provided is a medical valve that has a novel structure is able to more reliably support the outer peripheral portion of an elastic valve body with respect to a housing and prevents the problem of the elastic valve body becoming dislodged in the inward direction. The present invention is a medical valve (10) annular grooves (76 74) are formed at the elastic valve body (16) and a tubular support section (70) is formed at the outer peripheral side of an annular joining section (72) positioned between the annular grooves. An inside and outside holding section (20 18) engage the annular grooves (76 74) provided to the inside and outside valve surface of the annular joining section (72). The outside holding section (18) and inside holding section (20) are provided to an opening member (12) and a protruding section (28) that is inwards in the axial direction at the tubular support section (70) is supported by being sandwiched between the inside holding section (20) and outside holding section (18).
