A wireless apparatus including a button; a wireless communication interface; a processing unit to output encryption key information to another wireless apparatus using the wireless communication interface with lower transmission output than transmission output of information other than the encryption key information, responsive to detection of user's operation for the button; and a memory to store the output encryption key information corresponding to the another wireless apparatus. The wireless communication interface receives wireless signals from the another wireless apparatus and the processing unit decodes the information contained in the wireless signals and encrypted with the encryption key information. Also disclosed is an encryption key information managing method of managing encryption key information and a non-transitory readable-by-computer recording medium recorded with a program executed by a computer to manage encryption key information.