Abstract: The purpose of this study is to investigate internal and external influences on consumers purchasing decisions on cosmetic products in Tamilnadu and Kerala. The questionnaires were given to 500 consumers who are all using cosmetics. Out of 500 consumers contacted, 412 questionnaires were received with required coverage and details. The instruments of this study involved two parts: the first section of the instrument consisted of forced-choice questions about demographic characteristics: gender, marital status, age, occupation, monthly income level. The second section variables chosen for this study in order to measure the influence of consumer buying behaviour in cosmetics products. The Statistical Package for the Social Science (SPSS) for Microsoft Windows 20.00 was used to complete the analysis of the collected data.