To provide a partition for use in a V-measure of a drug divider, which is excellent in the cleanability of a drug to be left in the V-measure and which can be smoothly reciprocated in the V-measure.

The partition consists of a slide member having a guide receiving portion mounted reciprocally along a side plate, and a partition member 9 having a guide portion guided removably by the guide receiving portion of the slide member and reciprocated in the V-measure together with the slide member while being kept parallel to an end plate. A grip portion 8a for gripping the partition is integrated with the slide member, and the grip portion 8a is gripped to operate the partition, so that the partition can slide smoothly in the V-measure while being prevented from its strain.