PROBLEM TO BE SOLVED: To provide a chin holding solid body capable of fixing upward and holding a face by cheeks and a chin so that a nose or a mouth is positioned on a place capable of sucking unlimited air, and usable at a resting napping time or at a relaxation time before sleep.SOLUTION: A bilaterally symmetrical recessed place in which a part of the front side is lacked is provided from a periphery of a crossing spot between a vertical split center line and a bifurcate way center line, of a solid in which an outline shape on the upper surface side is symmetrical on the right and left sides in the front-to-back vertical split center line direction, concerning a shape of the exterior or the interior in a core or the like or a shape at a using time thereof.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 限界のない空気が吸える場所に鼻や口位置があるように、頬と顎で顔を上向きに留めて保持出来る、休憩仮眠時や睡眠前のリラックス時間に使用する、顎保持固定体を提供する。【解決手段】 外部や芯類における内部の形状あるいはそれらの使用時の形状に於いて、上面側の概略形状が、前後向き縦割中心線方向の左右側で対称形を示す立体の、前記縦割り中心線と横割り中央線の交差箇所付近から前側に向けて、前方側の一部が欠損した左右対称形の凹み箇所を設けたことを特徴とする。【選択図】図1