The present invention relates to a blood sugar level control system equipped with an insulin dispensing device 2 and a blood sugar measuring device 3. An attachment mechanism 4 is provided which serves to couple the insulin dispensing device 2 and said blood sugar measuring device 3 in a relatively movable manner. Preferably, the attachment mechanism 4 is constructed so that the blood sugar measuring device 3 is movable or slidable with respect to the insulin dispensing device 2. A blood sugar level control system can be provided which includes a blood sugar measuring device and an insulin dispensing device without using an adapter. Accordingly, it is possible to avoid a cost rise due to an increase in the number of parts as required. In addition, it is possible to prevent the blood sugar level control system from being unable to be used due to the loss of an adapter in the form of a different part.