A fuel cell of the present invention includes an electrolyte layer-electrode assembly (5), a first separator (4A), and a second separator (4C). A cooling water channel (8) is formed on a main surface of at least one of the first separator (4A) and the second separator (4C) so as to communicate with at least one of a first cooling water manifold hole (41) and a second cooling water manifold hole (51). A first channel forming portion (11) is located in at least one of the first cooling water manifold hole (41) and the second cooling water manifold hole (51) when viewed from a thickness direction of an electrolyte layer (1) and is provided so as to be opposed to at least a part of an end surface constituting the first cooling water manifold hole (41) and the second cooling water manifold hole (51).