| 摘要 |
PROBLEM TO BE SOLVED: To provide a bellows device at a low cost smoothly extensible/ contractible by preventing the central part from hanging downward by its own weight when a bellows is extended. SOLUTION: In this bellows device, having a wavy bellows formed continuously with a plurality of element surfaces flexed alternately in a reverse direction, both ends of a string body consisting of elastic material are respectively fixed to the element surface in bellows both ends, this string body is inserted to support holes drilled to be lined up in an extending/contracting direction of the bellows in each element surface existing between the element surfaces in the bellows both ends.
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