PURPOSE: To further increase the beauty of each icicle as decoration by forming icicles around a hanging bar-shaped body made of a transparent material, and illuminating the inside of each icicle through the bar-shaped body.

CONSTITUTION: In a cold atmosphere, a bar-shaped optical fiber 2 is suspended by an appropriate length from a supporting member, such as a building wall 1. Water is dropped along the optical fiber 2 by way of a pump 5 to form icicles 6 around the fiber. Light from a light source 3 is transmitted through the optical fiber from the end of the fiber to illuminate the inside of each icicle through the optical fiber 2. The illuminating light therefore allows the end of each icicle 6 on the optical axis to shine brightly, and is diffused from inside to outside, whereby figurative decorations can be obtained.