Abstract: A paper holder having a locking device for preventing clipping fingers from incidental opening comprising a back resilient plate, a pair of main bodies having longitudinal inner sides joining rotatably to each other and longitudinal outer sides embracing both of longitudinal outer sides of the back plate and rotatable at the embraced outer sides as pivotal portions and a plurality pairs of arcuate clipping fingers planted on the main bodies and capable of closing and opening by the vertical movement of the main bodies and a locking mechanism disposed at the end of the main bodies, wherein the locking mechanism comprises a manipulation member and an actuation portion disposed at the back thereof, in which the actuation member has an upper member and a lower member that extend horizontally opposing to each other to define a gap therebetween capable of receiving and vertically seizing the surface and the rear face of the longitudinal joining ends of the main body, whereby the upper member of the manipulation mem