The shift of brassieres is of importance from the point of view of flexibility when exercising including comfortableness to wear. This paper deals with the shift distribution of two samples, full-cup type and 3/4 cup type, after a radio gymnastic exercise. The radio gymnastic exercise was used here because of its repetitiousness. The relationship between the number of repetitions (one to three) and the quantity of shift was also examined. The following results were obtained. 1) The quantity of shift after the first repetition was large, while the quantity after the second and the third was small. 2) In both samples, the quantity of shift was larger near the axilla than the median line and the upper part of the brassiere's cup. 3) No significant difference in quantity was found between the two samples. Therefore, the quantity of shift had no relationship with the shape of cup. 4) While the distribution of shift for the full-cup type showed a similar tendency in both right and left cups, the 3/4 cup type showed a tendency to lean to one side.