To detect an error in the operation error without causing a malfunction in the operation.
There is provided a communication device including a communication unit configured to communicate with a communication partner device in accordance with a protocol, in which the protocol has at least one first operation and a second operation, the first operation includes identification information of the communication partner device, write-instructing information, identification information of a first storage unit of the communication partner device, and data to be written in the first storage unit, and the second operation is placed following the at least one first operation and includes identification information of the communication partner device, write-instructing information, identification information of a second storage unit of the communication partner device, information indicating a number of the protocols, and a cyclic redundancy check (CRC) code used to detect an error in the protocol, the second storage unit being configured to store the CRC code and the information indicating the number of the protocols.