To provide a pressure-sensitive copy sheet set which is easy to gather or to register and which is suitable for a multiple-printer which continuously gathers from printing.

The pressure-sensitive copy sheet set includes an upper sheet having a capsule layer on one surface of base paper containing a pulp as a main component, an intermediate sheet having a capsule layer on one surface and a developer layer on the other surface, and a lower sheet having a developer layer on one surface. In this set, a water filtration rate of the pulp is 290-390 ml. A difference of an underwater elongation between the sheets of the upper, intermediate and lower sheets in an MD direction (flowing direction) is 0%, and a difference of the underwater elongation between the sheets of the upper, intermediate and lower sheets is within ±0.1%.