To provide a guide light furnished with a guide flag, which can be used as not merely an excellent-handling guide light with a flag member contained in the nighttime but also a guide flag making use of the flag member in the daytime.

A guide light furnished with a guide flag is provided with a grip member H and a guide light body Y joined to the grip member H. The guide light body Y is provided with an outer cylinder 6, a luminescent tube 7 placed inside the outer sleeve 6, and a wind-up cylinder 17 provided rotatably between the outer cylinder 6 and the luminescent tube 7. A side edge of a flag member 11 made of luminescent material is attached to the wind-up cylinder 17. Moreover, the guide light body Y has a wind-up device 24 winding the flag member 11 around an outer circumference of the wind-up cylinder 17 by driving the flag member 11 in a wind-up direction. A slit 14 for drawing out the flag member 11 is formed along the outer cylinder 6. A lock device for locking the flag member 11 extended from the slit 14 of outer cylinder 6 with the flag member 11 drawn is provided with the guide light body Y.