To easily realize the confirmation of the presence and absence of the falsification in an antifalsifying pressure-sensitive copying sheet employing a back carbon paper.

A back carbon paper ink layer 5 is provided on the opposing surface side of a transfer sheet 2. Further, a color former microcapsule layer 6 including a color former, which develops color different from the color of the back carbon paper ink of the back carbon paper ink layer 5, in microcapsules is provided at important positions between the back carbon paper ink layer 5 and the transfer sheet 2. Furthermore, at least in a region opposing to the color former microcapsule layer 6 of the transfer sheet 2 in the opposing surface of an accepting sheet 3, a developer layer 7 is provided.