To suppress decrease in the temperature of an animal caused by general anesthesia during imaging by an MRI device.SOLUTION: A subject heat insulating device 7 mounted on an MRI device 100 is disposed on the radially inner side of a cylindrical high frequency coil 3 in the MRI device 100 and includes a hollow heat insulating mat 71 on which an animal as a subject A is placed. Further, the subject heat insulating device 7 includes: a warm air generating unit 90 which generates warm air to be supplied into the heat insulating mat 71； and an introducing duct 95 which feeds hot air sent from the warm air generating unit 90, to the heat insulating mat 71.SELECTED DRAWING: Figure 1【課題】ＭＲＩ装置による撮像中における全身麻酔によって生じる動物の体温低下を抑える。【解決手段】ＭＲＩ装置１００に搭載される被検体保温装置７は、ＭＲＩ装置１００における筒状の高周波コイル３の径方向内側に配置され、動物である被検体Ａが載置される中空の保温マット７１を備える。また、被検体保温装置７は、保温マット７１の内部に供給する温風を発生する温風発生部９０と、温風発生部９０からの温風を保温マット７１へ送る導入用ダクト９５とを備える。【選択図】図１
