An interprocessor communication device, in which a plurality of processors are interconnected to processor buses for an address signal, a data signal, and a control signal, receiving/outputting handshake signals for transmitting/receiving a message to/from an adjacent processor. A plurality of memory blocks are connected to memory buses for an address signal, a data signal, and a control signal and stores/outputs data upon input of an address signal and a control signal. A rotation bus interface module, connected between the processor buses and the memory buses, switches the memory buses connected to the processor buses in response to handshake signals received from two adjacent processors to allow the processors exclusively to access the memory blocks and thereby convey interprocessor data between the two adjacent processors.