A wearable article includes: an annular casing that surrounds a space into which a body of a user is to be inserted； a light-emitting element that is provided in the casing, the light-emitting element emitting light towards the space； an imaging element that is provided in the casing, the imaging element capturing and obtaining an image of the space when the light-emitting element emits light； and an authentication circuit that authenticates the user based on a vein pattern obtained in advance and the image.
