PURPOSE: To provide an illumination device which has a simple structure and few parts, is easy to manufacture and assemble, can effectively reduce the cost, and is suitable for low voltage in particular.

CONSTITUTION: A base 1 serving as an installation tool and a power guide part, a case body 2 fitted to the base 1, and a lamp body 3 held by the case body 2 are provided. The fitting means of the case body 2 to the base 1 and the holding means of the lamp body 3 to the case body 2 are removably constituted with pin-shaped connecting tools 7, 13 concurrently performing the electrical connection and mechanical connection. The case body 2 is made of a molding material mixed with conducting metal fibers 9 into an insulating resin material 8, and the electrical connection between the base l and the lamp body 3 is performed by the conducting metal fibers 9 portion.