An RFID reader-writer includes a housing in which an antenna and a wireless tag processor are housed. The housing includes a front surface, a rear surface facing the front surface, and plural side surfaces connected to the front surface and the rear surface. A reading surface and a front-side gripping surface are formed on the front surface. The antenna is disposed at a position inside the housing which faces the reading surface, such that the antenna can transmit and receive electromagnetic waves via the reading surface. A part of the rear surface which faces the front-side gripping surface is formed as a rear-side gripping surface. The front-side gripping surface and the rear-side gripping surface are configured as a handgrip for gripping the RFID reader-writer with a thumb and a finger.