In Cajabamba city, department of Cajamarca, the agricultural and commercial activity is developed specially on Sundays. The foreign and natural people that come from the field and the city, dynamism the demand of services: food, generating high competence among the restaurants. The purpose of the research is support to support how the quality of service has influence in the level of loyalty of the customer in the restaurant of study. For this reason the problem of the research in: in what way the quality of service has influence in the loyalty of the customer in the Mechita restaurant in the city of Cajabamba? About the methodology, the method deductive – inductive, analytic- synthetic and systemic has been used; the main technique used was the survey that has been applied to a sample of 86 customers of a total population of 800 people by a week. Among the most important results we hav...