Patent ID: 7614531

Claim:
An extendable/contractible strap device comprising: a first guide which is formed with a first slit and a third slit and a first intermediate part defined between the first slit and the third slit; a strap which has a first end connected to the first intermediate part; and a second guide which is arranged opposite to the first guide and which is formed with a second slit and a fourth slit and a second intermediate part defined between the second slit and the fourth slit, a surface at a side of the second slit of the second intermediate member being inclined with respect to an extending direction of the strap, wherein a second end of the strap passes through the second slit and the fourth slit, returns to the first guide, subsequently passes through the third slit and the first slit of the first guide, returns to the second guide and subsequently passes through the second slit of the second guide.