Disclosed herein is a new and distinct variety of Viola cornuta, named 'Sunviobuho', which is a vegetatively propagated variety. This new variety has a spreading growth habit with long prostrate stems. This Viola plant has many branches, and great profusion of blooms with the entire plant remaining in bloom for a considerable period of time. It displays dense green foliage, and single, small-sized flowers on long peduncles that are violet-blue and white in coloration. The plant exhibits good resistance to cold, diseases and pests.