When Caja de Pensiones para la Vejez y de Ahorros, 'la Caixa', was created in 1905, it was not only the transient response to a serious social, political, and economic problem, but it also provided a permanent solution by creating a long-lasting social welfare institution. In addition, its founder understood the responsibility of social welfare institutions not as an isolated responsibility for each institution, but as part of a harmonious whole that is a true moral entity with a socio-economic character, independence and unity of nature, purpose and form. The purpose of this article is to show how the conception of corporate social responsibility of Francesc Moragas, the founder of 'la Caixa,' informed the activities of the new institution in a variety of dimensions, including its service to its customers, its economic strengths, the social work and its participation in the creation of Spain's public social security system.