Medical valve

A medical valve, to which is to be separably connect a male luer (37), comprising: (a) a housing (1) having a hollow body opened at the upper end, in whose housing (1) to be introduced from removably a tip (38) of the male luer (37); (B) a spike (2) disposed to extend longitudinally in the housing (1), the spike (2) except at least a top end portion thereof, a shape approximately tapered in which the outside diameter becomes progressively towards the top end part, in which a passage (28) fluid transfer, open radially outwardly extending longitudinally in the spike (2), a bottom portion of the passage (28) fluid transfer connected to a fluid circuit; and (c) an elastic seal (3) of elastically deformable tubular shape fitted on the spike (2) to seal the spike (2), the elastic seal (3) comprising an upper end portion having a part (29) openable and closable that closed over the spike (2) openably, wherein the elastic seal (3) is elastically deformed to be downwardly shrunk by downward pressure due to the tip (38) of the male luer (37), whereby part (29) openable and closable is contacted with the spike (2) and is elastically deformed to be opened radially outwardly to be fitted onto the spike (2), so that the inside of the male luer (37) communicates with the passage (28) fluid transfer of the spike (2).