To provide a rain shielding device for a bicycle capable of easily carrying out setting and storage, being used with various kinds of umbrellas in a set and certainly avoiding rain from the front side.

The rain shielding device for a bicycle is provided with a transparent sheet material 1, a sheet winding up member 2 with a resilient means S for winding up the transparent sheet material 1 to a roll shape, and a support frame 3 for retaining the sheet winding up member 2 to an upper position of a handle 4 of the bicycle 20. Further, the support frame 3 is detachably fixed/retained to the handle 4 of the bicycle 20 through a fixing/retaining unit 5.