A mounting structure for a continuity testing unit is provided in which the plurality of continuity testing units can easily be mounted to or removed from a test board without using the bolt or the intricately-shaped pin, and which improves the efficiency of restoring the mounting arrangement of the continuity testing units. The mounting structure for a continuity testing unit includes a plurality of parallely-arranged rails arranged at a frame, a joint block arranged on the respective rails and a plurality of continuity testing units each including a plate portion and a pin portion arranged at the plate portion. The joint block includes a plurality of holes into which the pin portion is fitted in a disengageable manner. The plurality of holes is arranged in two lines. The plate portion is placed on the joint blocks on the two adjacent rails.