PURPOSE: To securely supply corrugated fiberboard sheets into a corrugated fiberboard caser magazine without flaws or tears caused after they are separated into a group containing an optional number of sheets, while they are received into the magazine with their front and rear ends arranged neatly.

CONSTITUTION: A corrugated fiberboard sheet supplier comprises a transfer conveyer 2 for mounting corrugated fiberboard sheets 1 in a standing state and continuously feeding them in a forward-bent state, a separating needle 7 for separating the transferred corrugated fiberboard sheets 2 from a front of a line into a group containing an optional number of sheets, a rocking frame 4 and a slide 5 for feeding a group 1a of the separated sheets, and a receiving plate 6 and an air cylinder 6a for supplying the group 1a of the fed sheets to a corrugated fiberboard caser magazine 12.