Provided is an information processing device including: a holding section configured to hold a card that stores personal information; and a main body that is provided with the holding section and connectable to a strap section including a sound collection unit and an acoustic output unit, in which the main body encloses a sound signal processing unit configured to process a sound acquired at least by the sound collection unit and a processing unit configured to execute predetermined processing on a basis of the personal information stored in the card held by the holding section.