The present disclosure eliminates the need for a buffer large enough to store a MAC PDU for the CRC check and eliminates processing delay involved in outputting data to, and inputting data from, the buffer. A wireless communication device analyzes and buffers an RLC data PDU, which is a data processing unit in the Radio Link Control layer (RLC layer), in the RLC layer without waiting for the completion of error detection processing, which is performed in the Medium Access Control layer (MAC layer), for a data processing unit (PDU) in the MAC layer. In the RLC layer, the wireless communication device references the result of the error detection processing for the MAC PDU performed in the MAC layer and creates an RLC Service Data Unit (RLC SDU) using an error-free RLC data PDU.