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.