To provide an abduction pillow which can easily perform posture change by a wearer while maintaining a desired abduction state of a leg.SOLUTION: The abduction pillow 1 includes a main body 10 having a first femoral accommodation portion 21 and a second femoral accommodation portion 22 which define a substantially columnar space provided continuously in the vertical direction, and the first thigh accommodation And the inner face of the second femoral accommodating portion increases as the distance d between them approaches the lower end 10 a of the main body and when the wearer accommodates the thigh in the first femoral accommodating portion and the second femoral accommodating portion, Is formed in a shape that maintains the everted state with respect to the wearers pelvis, and at least a part of the back surface of the main body has a curved surface that protrudes outward.BACKGROUND OF THE INVENTION【課題】所望の脚の外転状態を保持しつつ、装着者自身による体位変換を容易に行うことができる外転枕を提供する。【解決手段】外転枕1は、上下方向に連続して設けられた略柱状の空間を規定する第一大腿収容部21および第二大腿収容部22を有する本体10を備え、第一大腿収容部および第二大腿収容部の内面は、互いの距離dが本体の下端10aに近づくにつれて大きくなり、かつ装着者が第一大腿収容部および第二大腿収容部に大腿を収容した際に、大腿の少なくとも一方が装着者の骨盤に対して外転状態を維持する形状に形成されており、本体の背面の少なくとも一部は、外方に向かって凸となる曲面を有する。【選択図】図1