To provide a seal device which can be easily manufactured, which is not expensive relatively, and in which adjusting of a position of a slide film before starting junction of pipes is not necessary with relation to junction of the pipes.

A seal device to seal a coupling between two elements is composed of a space 60 parted by two mutually facing seal surfaces and disposed on the elements, and a seal element 62 compressed in the space 60 between the sea surfaces. The seal element 62 is inserted into the space 60, slide action is performed between one or plural slide surface(s) of one seal element and one or plural seal surface(s) 58 of the other, and the seal element is compressed there between the seal surfaces in the space. For facilitating sliding, one or plural slide surface(s) of the seal element 62 and/or one or plural seal surface(s) suitable to cooperation with one or plural slide surface(s) are provided with fiber groups 72 applied to the surface(s) at least partly.