A tilting seat for operators in a controlled environment, particularly for surgeons and the like, comprising a saddle, a chest support, a forehead support and a leg support connected to a base standing on the ground, such that the saddle, the chest support, the forehead support and the leg support are integrally movable with rotation about a horizontal-axis joint placed below the saddle, keeping the space over the joint free from movable elements while in use, guaranteeing the substantial lack of contamination in such space.