To provide a illumination controller of a showcase capable of accurately controlling illumination lamps of a plurality of the showcases corresponding to the presence/absence of customers in an optional place inside a shop.

When the customer enters a detection range A of respective object detection sensors 7, an illumination lamp 5 of an optional showcase 1 is lighted with a standard light quantity. When the customer leaves the detection range A, the illumination lamp 5 is lighted with a light quantity less than the standard light quantity. Thus, power consumption and heat dissipation by wastful illumination are surely reduced.