Proposal is a step toward marriage commonly done by men to deliver their purpose to marry girls and ask the girls’ parental blessing. Today, proposal in Javanese culture is various with the reasons of effectiveness in doing it and different situations. One of the varied proposals is that in Ngesong hamlet which is located in Tiron village, Banyakan subdistrict, Kediri regency. The phenomenon is tradition of staying overnight in a same house for the prospective bride and groom called ambruk. In this research, the researcher concerned in that entitled Ambruk Tradition in Ngesong Hamlet in View of Islamic Law. This research is a case study so that the researcher used the sociology of law for the approach. This is descriptive research using observation and interview in collecting the data. The research subject are Tiron village officials, the Tiron village chief, the village elders, the religious leaders and the people of Ngesong hamlet. Ambruk is a tradition done after engagement and determination of the wedding day with sumitting the prospective groom by his family to the prospective bride’s family. Ambruk has two elements; the prospective groom helps his future parents-in-law at work and stays overnight at their house. In the view of Islamic law, helping them is allowed but staying overnight is forbidden. It is included in ‘urf fāsid with concerns probably raising danger and sins of khalwah and zina, while the worries of those must be rejected as strong as possible. In conclusion, based on the concept of sadd al-dhari’ah that the tradition ambruk is not allowed according to the view of Islamic law.