Welfare is the subjective sense of satisfaction with life and can be defined in different ways. It is satisfaction with life dependent on success in family life, work, the approval of other people, opportunities for development, and many other factors. Mental welfare can be defined as the cognitive and emotional assessment of our own lives. This assessment includes both cognitive judgments of the sense of satisfaction and fulfillment, as well as emotional reactions to various events. Mental well-being includes three components: life satisfaction, positive affect and negative affect. Life satisfaction should be analyzed in specific dimensions of life such as health, family, work and considered as a cognitive component, which is based on the beliefs (attitudes) about the life of the individual human being. Positive and negative affect is used to calculate the intensity of pleasant and unpleasant feelings experienced by people throughout their life. This study presents the results of research concerning adolescents’ satisfaction with life, the inner satisfaction of their own attractiveness, interpersonal relationships, a sense of life. As a research technique used was a questionnaire, and it was carried out in four secondary schools in Warsaw in spring of 2012. The study involved 354 students aged 12-15. The survey was varied in form (partially structured) and included questions concerning the life style, material status, relations with friends and adults, addictions, domestic violence and violence in the adolescent group.