Provided is a motion suppression device which can reliably obtain the load to be applied to a body surface of a predetermined part of a patient on whom an examination and/or a treatment using radiation is to be performed, and which can reliably apply a predetermined load on the patient. The motion suppression device is used for an examination and/or a treatment using radiation, and includes: a fastening shell 14 that is formed from a nonmagnetic material that transmits radiation, and is formed from a thermoplastic resin as a member for pressing the body surface that corresponds to a predetermined part of a patient to suppress motion of the predetermined part； a strain sensor 19 that is inserted between the body surface and the fastening shell 14 and detects the load applied to the body surface of the patient by the fastening shell 14； and, as a means for adjusting pressure to the body surface of the patient applied by the fastening shell 14, a motion suppression bag B that has an air supply channel 18 which extends from a bag-like portion 16 made from a nonmagnetic material that transmits radiation, and supplies air for expanding the bag-like portion 16 such that the load to be applied to the body surface is adjustable.L'invention concerne un dispositif de suppression de mouvement permettant d'obtenir de façon fiable la charge à appliquer sur une surface corporelle d'une partie prédéterminée du corps d'un patient sur lequel un examen et/ou un traitement à base de rayonnement doit/doivent être effectué(s), et permettant d'appliquer de façon fiable une charge prédéterminée sur le patient. Le dispositif de suppression de mouvement selon l'invention est utilisé pour un examen et/ou un traitement à base de rayonnement, et comprend : une coque de fixation (14) formée à partir d'un matériau non magnétique qui transmet un rayonnement et comprenant une résine thermoplastique constituant un élément destiné à appuyer sur la surface corporelle correspondant à une partie prédéte
