This study aims to determine and analyze the Legal Protection of the Menstrual Leave Rights of Female Workers Based on Law Number 13 of 2003 Concerning Manpower and Its Relation to the Principle of Justice (Study at PT. APSL and PT. SJML). This study discusses whether Menstrual Leave has been implemented by PT. SJML and PT. APSL. This study shows that Menstrual Leave has not been implemented a…