The spread of word of mouth on the Internet was made possible by the development of social networks that provide the possibility for consumers to be actively involved in the marketing process. Furthermore, development social networks resulted in opening the way for the development of new forms in marketing, one of influencer marketing is one of them. This form of marketing can greatly influence the sel consumers, so companies cooperate with influencers more and more often because they could more easily a way to reach the very market they are targeting. The main goal of this thesis is to determine influence of influencers on consumers when making a decision to buy cosmetic product and the influence of factors that influence the consumer's perception of the influencer's credibility, that is, in which phase do consumers think that influencers have the greatest influence on them. Influenceinfluencers and influencer marketing can play a decisive role in decision-making shopping. The mentioned terms represent relatively new areas that are still being used today are investigating. The analysis of the results of the empirical research provided a deeper insight into the influence of influencers on consumers when making a decision to buy cosmetic products that are widely available today widespread in the market and a large profit is made from them. The primary research data are collected using a survey questionnaire, and the results obtained suggest how they are research participants are mostly neutral regarding the attitude of influencers on shopping.