Disclosed is an
underwater posture stabilization device that, when attached to various
underwater machines, such as undersea machines and
underwater vehicles, which have different shapes and centers of gravity according to their purpose, allows their posture in the water (the basic posture) to be set easily and reliably. The device is extremely versatile, and the moment to return it to the original posture is created spontaneously when the posture is inclined due to the effect of tidal currents, pulsating currents or the like, so it has excellent postural stability. In addition, the posture can be changed easily as needed. Furthermore, the posture can be controlled in a stable manner, even in complex tidal currents or pulsating currents, and the reliability, stability and
dependability of the
postural control are excellent. The device is equipped with: a frame, which is attached to the main body of the underwater
machine; a pair of slide parts arranged such that they can freely move forward / backward on either side of the frame; support members, the lower ends of which are affixed to each slide part, arranged facing upward or slanting upward and able to move freely upward / downward; floating bodies arranged at the ends of each support member.