Seal structure of fuel cell unit and manufacturing method of the same

The invention relates to a seal structure of a fuel cell unit (10) which permits easier rebuilding (reassembling) and recycling of the fuel cell unit (10), and a manufacturing method of the same structure. The seal structure of a fuel cell unit (10) in which a plurality of stacked components of the fuel cell unit (10) are sealed, comprising: a sealant (32) is provided which is made of a material which maintains an initial material state even under an environment where the fuel cell unit (10) is used, the material being selected from a gel material, high viscosity material and pressure-sensitive adhesive material, a retaining portion (33) is formed at least one of two of the components of the fuel cell unit (10) between which the sealant (32) is interposed, characterized in that the retaining portion (33) is arranged to prevent the sealant (32) from moving. Also, the process of hardening the sealant is performed as a process, which is different from and precedes the process of stacking the components.