A floating apparatus (3) and an ultrasonic device. A first moving member (33) and a second moving member (34) are configured to reciprocate in an arc-shaped or circular trajectory on a support member (31). Meanwhile, both ends of lift arms (35, 36) are hingedly connected to moving members (33, 34) and a connection base (39), respectively. When a user applies force to the connection base (39) or the lift arms (35, 36), the positions of the first moving member (33) and the second moving member (34) on the support member (31) can be changed, so that the first moving member (33) and the second moving member (34) are distant from and get close to each other on the support member (31) according to the stress in the arc-shaped or circular trajectory. Meanwhile, the angle between the lift arms (35, 36) and the connection base (39), and the moving members (33, 34) can also be changed according to the stress, so that multi-position movement and rotation is achieved for the connection base (39) in a plane. Meanwhile, the lift arms (35, 36) have the lift function, so that the spatial floating in horizontal and vertical directions can be achieved by combining other components. The structure is more simplified while achieving multi-azimuth floating in horizontal and vertical directions, and improves the compactness of the apparatus, and the linkage flexibility is better.L'invention concerne un appareil flottant (3) et un dispositif à ultrasons. Un premier élément mobile (33) et un second élément mobile (34) sont conçus pour effectuer un mouvement de va-et-vient dans une trajectoire arquée ou circulaire sur un élément de support (31). Pendant ce temps, les deux extrémités des bras de levage (35, 36) sont reliées de manière articulée à des éléments mobiles (33, 34) et à une base de liaison (39), respectivement. Lorsqu'un utilisateur applique une force à la base de liaison (39) ou aux bras de levage (35, 36), les positions du premier élément mobile (33) et du second élément mobile (
