A sailing device suitable for a pleasure boat or the like of narrow width which is small in restoring force against traverse tilt. The sailing device is characterized by comprising a sail portion A composed of a backbone, a pair of left and right spars 3a, 3b extending obliquely backward from the fore end of the backbone 1, and a sail-cloth 8 attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone 1, and a strut 4 extending downward from the fore end of the backbone 1. The lower end of the strut is directly mounted on the boat hull for rise and fall or indirectly attached to the boat hull by support of a user.