The present invention relates to a bidet which is attached to a toilet so as to spray water and, particularly, to a bidet operated by water pressure, comprising: a bracket which is installed on the lower side of a rear portion of a seat plate coupled to a toilet a case which is fixed to the bracket by a fixing nut so as to adjust an angle by coupling screw bars on both sides thereof, wherein an external water supply hose is connected to a connection pipe at a rear portion of the case a partition plate which is installed inside the case and includes a through hole for partitioning a cylinder chamber and an operation chamber a fixing shaft which is supported on a rear portion of the cylinder chamber inside the case by a support, and which has, on a front end part thereof, a tapered portion that extends upwards to the operation chamber by penetrating the through hole of the partition plate and a piston which is made of a heavyweight body, has a supply ball that is coupled to an outer surface of the fixing shaft, and has an outer surface that is combined to the cylinder chamber such that the piston is moved by water pressure by being guided along the fixing shaft and the cylinder chamber, wherein the piston has a tapered pipe for supplying water to a spray hole of a spray head.La présente invention porte sur un bidet, qui est attaché à des toilettes de façon à pulvériser de leau, et, en particulier, sur un bidet actionné par une pression deau, lequel bidet comprend : un support qui est installé sur le côté inférieur dune partie arrière dune plaque de siège couplée à des toilettes une enceinte qui est fixée au support par un écrou de fixation de façon à régler un angle par le couplage de barre de vis des deux côtés de celle-ci, un tuyau dalimentation en eau externe étant relié à un tuyau de liaison à une partie arrière de lenceinte une plaque de séparation qui est installée à lintérieur de lenceinte et qui comprend un trou traversant pour séparer une chambre cylindriqu
