The family of an elderly woman missing for almost a week near Napier is mystified about her disappearance.

Fiona Wills hasn't been seen since around 6pm last Tuesday night, when she left a property near Te Pohue on the Napier-Taupo Road to feed chickens.

There's been no sign of the 77 year old who has dementia.

Her son and former Federated Farmers national president, Bruce Wills is appealing for information from the public.