The present invention relates to a pill case capable of being used as a PET bottle cap. According to the present invention, the pill case can be easily stored and is carried with the PET bottle. Therefore, a user can take a pill and drink water by carrying the pill case. The pill case capable of being used as a PET bottle cap includes a PET bottle cap part (201), which is integrated with a lower part of a pill container (200). The pill container (200) can be used as a cap of a PET bottle. The PET bottle cap part (201) is made of a plastic material formed in a structure that joins the plastic material with a PET bottle inlet (101).COPYRIGHT KIPO 2015본 발명은 약병을 쉽게 보관하며 페트병과 함께 소지를 하여 약을 먹을 때, 약과 물을 함께 복용할 수 있는 특징을 갖는 발명이다.
