To examine a contamination state of a worker having worked in a radiation controlled zone, a first unit detects contamination of a front or back surface of the worker and outputs a first signal indicating a contamination state of the surface. A second unit detects contamination of an arm's inner side surface of the worker and outputs a second signal indicating a contamination state of the arm's side surface. A third unit detects contamination of a trunk's side surface of the worker and outputs a third signal indicating a contamination state of the trunk's side surface. A processing unit detects the presence of contamination of the front or back surface and the armpit's both sides based on the outputted first signal, on the second signal output when the second unit moves up together with the third unit, and on the third signal output when the third unit moves up.