A fuel cell comprising: a membrane electrode assembly (MEA, 100); a separator stacked on a surface of the membrane electrode assembly ; a beading portion protruding from a first surface of the separator that faces the membrane electrode assembly; and a sealing member disposed between the membrane electrode assembly and the beading portion and being configured to seal a portion between the membrane electrode assembly and the separator , characterized in that the separator comprises: a flow path part disposed on the first surface of the separator and configured to define a region in which a reactant gas reacts; a manifold part disposed in the separator and spaced apart from the flow path part ; a junction channel disposed between the flow path part and the manifold part ; a plurality of first distribution channels provided on a second surface of the separator and configured to connect the manifold part and the junction channel , to distribute the reactant gas introduced into the manifold part , and to supply the reactant gas to the junction channel ; and a plurality of second distribution channels disposed on the first surface of the separator and configured to connect the junction channel and the flow path part , to distribute the reactant gas introduced into the junction channel , and to supply the reactant gas to the flow path part . a membrane electrode assembly (MEA, 100); a separator stacked on a surface of the membrane electrode assembly ; a beading portion protruding from a first surface of the separator that faces the membrane electrode assembly; and a sealing member disposed between the membrane electrode assembly and the beading portion and being configured to seal a portion between the membrane electrode assembly and the separator , characterized in that the separator comprises: a flow path part disposed on the first surface of the separator and configured to define a region in which a reactant gas reacts; a manifold part disposed in the separator and spaced apart from the flow path part ; a junction channel disposed between the flow path part and the manifold part ; a plurality of first distribution channels provided on a second surface of the separator and configured to connect the manifold part and the junction channel , to distribute the reactant gas introduced into the manifold part , and to supply the reactant gas to the junction channel ; and a plurality of second distribution channels disposed on the first surface of the separator and configured to connect the junction channel and the flow path part , to distribute the reactant gas introduced into the junction channel , and to supply the reactant gas to the flow path part . a flow path part disposed on the first surface of the separator and configured to define a region in which a reactant gas reacts; a manifold part disposed in the separator and spaced apart from the flow path part ; a junction channel disposed between the flow path part and the manifold part ; a plurality of first distribution channels provided on a second surface of the separator and configured to connect the manifold part and the junction channel , to distribute the reactant gas introduced into the manifold part , and to supply the reactant gas to the junction channel ; and a plurality of second distribution channels disposed on the first surface of the separator and configured to connect the junction channel and the flow path part , to distribute the reactant gas introduced into the junction channel , and to supply the reactant gas to the flow path part . <EOS>