An aspect of the invention provides an illumination structure that can illuminate both a neighborhood of an opening and a storage portion with a simple configuration. An illumination structure (1) includes an illumination device (4) provided in an opening (3) of a vehicle (2), and a person can get on and off the vehicle (2) through the opening (3). The illumination device (4) is fixed to a step garnish (5) provided in a lower end portion (3a) of the opening (3). A translucent member (18) is provided in a bottom surface of a storage portion (9) formed in a door lining (10). When a door (6) is closed against the opening (3), the storage portion (9) is disposed on the step garnish (5), whereby the illumination structure (1) is retained while the illumination device (4), a first translucent member (18a), and a second translucent member (18b) line up in the order from the bottom.