Abstract: A carton cuing device includes housing and a guard member extending about the exterior of and pivotally attached to the housing. The housing includes a handle portion, neck portion, and hook portion which together define a cutting area therebetween and a channel therein for receiving and supporting a blade partially disposed in the cutting area. A frictionally slidable stop member is displaceable within the channel of the handle portion for abutting engagement with a blade received in the channel for supporting the blade from sliding within the channel. A spring is disposed between the guard member and the housing and urges the guard member into a first position in abutment with the hook portion for closing the cutting area to cutting. The guard member is displaceable by a carton to be cut to a second position in abutment with the handle portion for opening of the cutting area to cutting, and to all positions between the first and second positions for at least partial opening of the cutting area to cutting.