Provided are a novel crystalline polymorph of levonorgestrel useful as an emergency contraceptive and the like, a method for producing the same, and a pharmaceutical composition. The crystal polymorph β of levonorgestrel of the present invention has a diffraction angle 2θ of 2θ = 13.9 ° ± 0.2 °, 14.5 ° ± 0.2 °, 21.3 ° in a powder X-ray diffraction spectrum. Diffraction peaks at angles of ± 0.2 °, 24.9 ° ± 0.2 ° and 28.2 ° ± 0.2 °, diffraction peaks at angles of 2θ = 18.6 ° ± 0.2 ° There is substantially no.緊急避妊薬などとして有用なレボノルゲストレルの新規結晶多形及びその製造方法、並びに医薬組成物を提供する。 本発明のレボノルゲストレルの結晶多形βは、粉末Ｘ線回折スペクトルにおいて、回折角度２θが、２θ＝１３．９°±０．２°，１４．５°±０．２°，２１．３°±０．２°，２４．９°±０．２°及び２８．２°±０．２°の角度に回折ピークを有し、２θ＝１８．６°±０．２°の角度に回折ピークを実質的に有さない。
