To form a jointing body (membrane electrode ) of an electrode and a solid polyelectrolyte membrane superior in reliability and durability by suppressing wrinkles of the solid polyelectrolyte membrane that occurs at hot pressing at the jointing of the electrode and the solid polyelectrolyte membrane.

This is a device for jointing electrodes 1, 2 and a solid polyelectrolyte membrane 3 of a solid polymer type fuel cell that has a pair of electrodes 1, 2 and a solid polyelectrolyte membrane 3 to be jointed in a state of being nipped by the pair of the electrodes 1, 2, and is provided with a pair of pressurizing bodies 11, 12 for pressing the pair of electrodes 1, 2 in the direction mutually approaching each other and a hot plate 13 which has the same dimensions as those of the electrodes 1, 2 and heats by contacting only the electrodes 1, 2 is provided on the pair of the pressurizing bodies 11, 12.