To provide a device for raising only a fly of a self-supported tent which has two parts sufficing for adjusting size and shows an estimate for length on ribbon shaped ropes to indicate an adjusted length and has two ribbon shaped ropes differentiated by their color.

A pole is raised with ribbon shaped ropes which are diagonally strained to fix a top end of the pole. The two ribbon shaped ropes are passed through a central ring and adjusters for length are attached to the respective ropes. The two ribbon shaped ropes are differentiated by color to be easily differentiated when installed. The estimate for length is marked on the ribbon shaped ribbons to indicate the adjusted length. A fixing part for fixing the pole corresponding to two kinds is attached to the top end of the ribbon shaped rope.