Provided is a steam sterilization device designed to shorten sterilization work time while being able to provide an appropriate temperature distribution. A steam sterilization device (30) provided with: a sterilization tank (32), which houses the object to be sterilized and which performs sterilization of the object being sterilized by maintaining the supplied steam at a prescribed temperature and prescribed pressure a steam-supplying tube (41) for supplying the steam into the sterilization tank (32) and a steam-supplying tube valve (44) for controlling the steam flow rate flowing through the steam-supplying tube (41). The steam-supplying tube (41) is provided with a diameter such that the interior of the sterilization tank (32) can achieve a pressure increase rate of 100 kPa/min or more. The device is provided with a control unit (74), which controls the steam-supplying tube valve (44) so as to be fully open in a conditioning process in which steam introduction into and exhausting from the inside of the sterilization tank (32) are performed repeatedly, and controls the degree of opening of the steam-supplying tube valve (44) in the sterilization process after the conditioning process so as to give a prescribed steam supply rate.Linvention concerne un dispositif de stérilisation à vapeur conçu pour raccourcir la durée de stérilisation tout en fournissant une distribution appropriée de la température. Linvention concerne un dispositif de stérilisation (30) comprenant : une cuve de stérilisation (32) qui loge lobjet à stériliser et qui réalise une stérilisation de lobjet à stériliser en maintenant la vapeur fournie à une température prescrite et une pression prescrite un tube dalimentation de vapeur (41) pour lintroduction de la vapeur dans la cuve de stérilisation (32) et une vanne de tube dalimentation de vapeur (44) pour réguler le débit de la vapeur dans le tube dalimentation de vapeur (41). Le tube dalimentation de vapeur (41) a un diamètre tel que lintérieur d
