To provide a cell shaping unit whose transmission efficiency is enhanced.

The cell shaping unit 100 controls outputting cells (A cells) where the immediacy is a requirement and no data loss is allowed and cells (B cells) where no immediacy is a requirement and a data loss is allowed to one VC (Virtual Channel) 150, and is configured to have a memory block 101 receiving the A cells, a memory block 102 that receives the B cells, and band generating sections 103, 104 and an output selection section 105 that monitor cells received by the memory blocks 101, 102, set the transmission rate of the A cells to a rate mCR specified by the VC 150, set the transmission rate of the B cells to a PCR (Peak Cell Rate) specified by the VC 150, and control of outputting the cells onto the VC 150 by placing the priority of the output in the order of the A cells and the B cells.