Provided is a sensor that is able to efficiently identify a variety of motions made by a user. The sensor includes: a structure body configured to be deformable by an external force; an electrode configured to be disposed at an arbitrary position of the structure body; a determination unit configured to determine a contact state of an object with the structure body based on a change in impedance measured using the electrode; and an output unit configured to output a signal based on the contact state of the object with the structure body to an external device.