PROBLEM TO BE SOLVED: To provide subject holding means for suppressing the attenuation of a supersonic wave in the subject and improving an S/N ratio of a signal.SOLUTION: A subject information obtaining apparatus includes shape detector means 15 configured to detect the shape of a holding member 11 holding a subject and shape controlling means 2 configured to control the shape of the holding member so as to bring the thickness of the subject being held to a predetermined thickness or below on the basis of a detection result of the shape detector means 15.COPYRIGHT: (C)2015,JPO&INPIT【課題】被検体内での超音波の減衰を低減させ信号のS/N比を向上させることが可能な被検体保持手段を提供する。【解決手段】被検体を保持した際の保持部材11の形状を検知する形状検知手段15と、形状検知手段の検知結果に基づいて、保持した際の被検体の厚みを所定の厚さに収めることができるように保持部材の形状を制御する形状制御手段2を有する。【選択図】図1