In a fuel cell assembly (1) comprising an electrolyte layer (2) having a
frame (21) and an electrolyte (22) retained in the frame, a pair of
separators (5, 6) are bonded to the electrolyte layer by that a metallic
material (27) is deposited on one of the frame and each separator and a
laser beam is irradiated onto the metallic material through the frame or
the separator in a state that the frame and each separator contact each
other whereby the metallic material forms a eutectic with the other of
the frame and each separator.